Template:Cannabis sidebar Cannabis, also known as marijuana among other names,[note 1] is a psychoactive drug from the Cannabis plant. Native to Central and South Asia, the cannabis plant has been used as a drug for both recreational and entheogenic purposes and in various traditional medicines for centuries. Tetrahydrocannabinol (THC) is the main psychoactive component of cannabis, which is one of the 483 known compounds in the plant, including at least 65 other cannabinoids, including cannabidiol (CBD). Cannabis can be used by smoking, vaporizing, within food, or as an extract.
Cannabis has various mental and physical effects, which include euphoria, altered states of mind and sense of time, difficulty concentrating, impaired short-term memory, impaired body movement (balance and fine psychomotor control),:p7 relaxation, and an increase in appetite. Onset of effects is felt within minutes when smoked, but may take up to 90 minutes when eaten. The effects last for two to six hours, depending on the amount used. At high doses, mental effects can include anxiety, delusions (including ideas of reference), hallucinations, panic, paranoia, and psychosis. There is a strong relation between cannabis use and the risk of psychosis, though the direction of causality is debated. Physical effects include increased heart rate, difficulty breathing, nausea, and behavioral problems in children whose mothers used cannabis during pregnancy; short-term side effects may also include dry mouth and red eyes. Long-term adverse effects may include addiction, decreased mental ability in those who started regular use as adolescents, chronic coughing, susceptibility to respiratory infections, and cannabinoid hyperemesis syndrome.
Cannabis is mostly used recreationally or as a medicinal drug, although it may also be used for spiritual purposes. In 2013, between 128 and 232 million people used cannabis (2.7% to 4.9% of the global population between the ages of 15 and 65). It is the most commonly used illegal drug in the world, though it is legal in some jurisdictions, with the highest use among adults (as of 2018[update]) in Zambia, the United States, Canada, and Nigeria.
While cannabis plants have been grown since at least the 3rd millennium BCE, evidence suggests that it was being smoked for psychoactive effects at least 2,500 years ago in the Pamir Mountains. Since the early 20th century, cannabis has been subject to legal restrictions. The possession, use, and cultivation of cannabis is illegal in most countries. In 2013, Uruguay became the first country to legalize recreational use of cannabis. Other countries to do so are Canada, Georgia, Malta, Mexico, and South Africa, plus 19 states, two territories, and the District of Columbia in the United States (though the drug remains federally illegal).
- 1 Uses
- 2 Modes of cannabis consumption
- 3 Adverse effects
- 4 Pharmacology
- 5 Chemistry
- 6 Varieties and strains
- 7 Preparations
- 8 History
- 9 Society, culture, legal status, and economics
- 10 Cannabis as a gateway drug
- 11 Research issues
- 12 See also
- 13 References
- 14 External links
Medical cannabis, or medical marijuana, refers to the use of cannabis to treat disease or improve symptoms; however, there is no single agreed-upon definition (e.g., cannabinoids derived from cannabis and synthetic cannabinoids are also used). The rigorous scientific study of cannabis as a medicine has been hampered by production restrictions and by the fact that it is classified as an illegal drug by many governments. There is limited evidence suggesting cannabis can be used to reduce nausea and vomiting during chemotherapy, to improve appetite in people with HIV/AIDS, or to treat chronic pain and muscle spasms. Its use for other medical applications is insufficient for drawing conclusions about safety or efficacy. There is evidence supporting the use of cannabis or its derivatives in the treatment of chemotherapy-induced nausea and vomiting, neuropathic pain, and multiple sclerosis. Lower levels of evidence support its use for AIDS wasting syndrome, epilepsy, rheumatoid arthritis, and glaucoma.
So far, the medical use of cannabis is legal only in a limited number of territories, including Canada, Belgium, Australia, the Netherlands, New Zealand, Spain, and many U.S. states. This usage generally requires a prescription, and distribution is usually done within a framework defined by local laws.
According to DEA Chief Administrative Law Judge, Francis Young, "cannabis is one of the safest therapeutically active substances known to man." Being under the effects of cannabis is usually referred to as being "high" or "stoned." Cannabis consumption has both psychoactive and physiological effects. The "stoned" experience can vary widely, based (among other things) on the user's prior experience with cannabis, and the type of cannabis consumed.:p647 When smoking cannabis, a euphoriant effect can occur within minutes of smoking.:p104 Aside from a subjective change in perception and mood, the most common short-term physical and neurological effects include increased heart rate, increased appetite, impairment of short-term and working memory, and psychomotor coordination.
Additional desired effects from consuming cannabis include relaxation, a general alteration of conscious perception, increased awareness of sensation, increased libido and distortions in the perception of time and space. At higher doses, effects can include altered body image, auditory and/or visual illusions, pseudohallucinations and ataxia from selective impairment of polysynaptic reflexes. In some cases, cannabis can lead to dissociative states such as depersonalization and derealization.
Cannabis has held sacred status in several religions and has served as an entheogen – a chemical substance used in religious, shamanic, or spiritual contexts – in the Indian subcontinent since the Vedic period. The earliest known reports regarding the sacred status of cannabis in the Indian subcontinent come from the Atharva Veda, estimated to have been composed sometime around 1400 BCE. The Hindu god Shiva is described as a cannabis user, known as the "Lord of bhang.:p19
Modes of cannabis consumption
- Smoking, which typically involves burning and inhaling vaporized cannabinoids ("smoke") from small pipes, bongs (portable versions of hookahs with a water chamber), paper-wrapped joints or tobacco-leaf-wrapped blunts, and other items.
- Vaporizer, which heats any form of cannabis to Template:Convert/–, causing the active ingredients to evaporate into vapor without burning the plant material (the boiling point of THC is Template:Convert/°C at atmospheric pressure).
- Cannabis tea, which contains relatively small concentrations of THC because THC is an oil (lipophilic) and is only slightly water-soluble (with a solubility of 2.8 mg per liter). Cannabis tea is made by first adding a saturated fat to hot water (e.g. cream or any milk except skim) with a small amount of cannabis.
- Edibles, where cannabis is added as an ingredient to one of a variety of foods, including butter and baked goods. In India it is commonly made into a beverage, bhang.
- Tincture of cannabis, sometimes known as green dragon, is an alcoholic cannabis concentrate.
- Capsules, typically containing cannabis oil, and other dietary supplement products, for which some 220 were approved in Canada in 2018.
Acute negative effects may include anxiety and panic, impaired attention and memory, an increased risk of psychotic symptoms,[note 2] the inability to think clearly, and an increased risk of accidents. Cannabis impairs a person's driving ability, and THC was the illicit drug most frequently found in the blood of drivers who have been involved in vehicle crashes. Those with THC in their system are from three to seven times more likely to be the cause of the accident than those who had not used either cannabis or alcohol, although its role is not necessarily causal because THC stays in the bloodstream for days to weeks after intoxication.[note 3]
Some immediate undesired side effects include a decrease in short-term memory, dry mouth, impaired motor skills, reddening of the eyes, dizziness, feeling tired and vomiting. Some users may experience an episode of acute psychosis, which usually abates after six hours, but in rare instances, heavy users may find the symptoms continuing for many days.
Legalization has increased the rates at which children are exposed to cannabis, particularly from edibles. While the toxicity and lethality of THC in children is not known, they are at risk for encephalopathy, hypotension, respiratory depression severe enough to require ventilation, somnolence and coma.
Cannabis is suspected of being a potential, and under-reported, contributory factor or direct cause in cases of sudden death, due to the strain it can place on the cardiovascular system. Multiple deaths have been attributed to cannabinoid hyperemesis syndrome.
A 16-month survey of Oregon and Alaska emergency departments found a report of the death of an adult who had been admitted for acute cannabis toxicity.
A 2015 meta-analysis found that, although a longer period of abstinence was associated with smaller magnitudes of impairment, both retrospective and prospective memory were impaired in cannabis users. The authors concluded that some, but not all, of the deficits associated with cannabis use were reversible. A 2012 meta-analysis found that deficits in most domains of cognition persisted beyond the acute period of intoxication, but was not evident in studies where subjects were abstinent for more than 25 days. Few high quality studies have been performed on the long-term effects of cannabis on cognition, and the results were generally inconsistent. Furthermore, effect sizes of significant findings were generally small. One review concluded that, although most cognitive faculties were unimpaired by cannabis use, residual deficits occurred in executive functions. Impairments in executive functioning are most consistently found in older populations, which may reflect heavier cannabis exposure, or developmental effects associated with adolescent cannabis use. One review found three prospective cohort studies that examined the relationship between self reported cannabis use and intelligence quotient (IQ). The study following the largest number of heavy cannabis users reported that IQ declined between ages 7–13 and age 38. Poorer school performance and increased incidence of leaving school early were both associated with cannabis use, although a causal relationship was not established. Cannabis users demonstrated increased activity in task-related brain regions, consistent with reduced processing efficiency.
A reduced quality of life is associated with heavy cannabis use, although the relationship is inconsistent and weaker than for tobacco and other substances. The direction of cause and effect, however, is unclear.
Although global abnormalities in white matter and grey matter are not associated with heavy cannabis use, reduced hippocampal volume is consistently found. Amygdala abnormalities are sometimes reported, although findings are inconsistent.
Cannabis use is associated with increased recruitment of task-related areas, such as the dorsolateral prefrontal cortex, which is thought to reflect compensatory activity due to reduced processing efficiency. Cannabis use is also associated with downregulation of CB1 receptors. The magnitude of down regulation is associated with cumulative cannabis exposure, and is reversed after one month of abstinence. There is limited evidence that chronic cannabis use can reduce levels of glutamate metabolites in the human brain.
About 9% of those who experiment with marijuana eventually become dependent according to DSM-IV (1994) criteria. A 2013 review estimates daily use is associated with a 10–20% rate of dependence. The highest risk of cannabis dependence is found in those with a history of poor academic achievement, deviant behavior in childhood and adolescence, rebelliousness, poor parental relationships, or a parental history of drug and alcohol problems. Of daily users, about 50% experience withdrawal upon cessation of use (i.e. are dependent), characterized by sleep problems, irritability, dysphoria, and craving. Cannabis withdrawal is less severe than withdrawal from alcohol.
According to DSM-V criteria, 9% of those who are exposed to cannabis develop cannabis use disorder, compared to 20% for cocaine, 23% for alcohol and 68% for nicotine. Cannabis use disorder in the DSM-V involves a combination of DSM-IV criteria for cannabis abuse and dependence, plus the addition of craving, without the criterion related to legal troubles.
At an epidemiological level, a dose–response relationship exists between cannabis use and increased risk of psychosis and earlier onset of psychosis. Although the epidemiological association is robust, evidence to prove a causal relationship is lacking. But a biological causal pathway is plausible, especially if there is a genetic predisposition to mental illness, in which case cannabis may be a trigger.Template:Better source needed
Cannabis may also increase the risk of depression, but insufficient research has been performed to draw a conclusion. Cannabis use is associated with increased risk of anxiety disorders, although causality has not been established.
A February 2019 review found that cannabis use during adolescence was associated with an increased risk of developing depression and suicidal behavior later in life, while finding no effect on anxiety.
Heavy, long-term exposure to marijuana may have physical, mental, behavioral and social health consequences. It may be "associated with diseases of the liver (particularly with co-existing hepatitis C), lungs, heart, and vasculature". A 2014 review found that while cannabis use may be less harmful than alcohol use, the recommendation to substitute it for problematic drinking was premature without further study. Various surveys conducted between 2015 and 2019 found that many users of cannabis substitute it for prescription drugs (including opioids), alcohol, and tobacco; most of those who used it in place of alcohol or tobacco either reduced or stopped their intake of the latter substances.
Cannabinoid hyperemesis syndrome (CHS) is a severe condition seen in some chronic cannabis users where they have repeated bouts of uncontrollable vomiting for 24–48 hours. Four cases of death have been reported as a result of CHS.
A limited number of studies have examined the effects of cannabis smoking on the respiratory system. Chronic heavy marijuana smoking is associated with coughing, production of sputum, wheezing, and other symptoms of chronic bronchitis. The available evidence does not support a causal relationship between cannabis use and chronic obstructive pulmonary disease. Short-term use of cannabis is associated with bronchodilation. Other side effects of cannabis use include cannabinoid hyperemesis syndrome (CHS), a condition which involves recurrent nausea, cramping abdominal pain, and vomiting.
Cannabis smoke contains thousands of organic and inorganic chemical compounds. This tar is chemically similar to that found in tobacco smoke, and over fifty known carcinogens have been identified in cannabis smoke, including; nitrosamines, reactive aldehydes, and polycylic hydrocarbons, including benz[a]pyrene. Cannabis smoke is also inhaled more deeply than tobacco smoke. As of 2015[update], there is no consensus regarding whether cannabis smoking is associated with an increased risk of cancer. Light and moderate use of cannabis is not believed to increase risk of lung or upper airway cancer. Evidence for causing these cancers is mixed concerning heavy, long-term use. In general there are far lower risks of pulmonary complications for regular cannabis smokers when compared with those of tobacco. A 2015 review found an association between cannabis use and the development of testicular germ cell tumors (TGCTs), particularly non-seminoma TGCTs. Another 2015 meta-analysis found no association between lifetime cannabis use and risk of head or neck cancer. Combustion products are not present when using a vaporizer, consuming THC in pill form, or consuming cannabis foods.
There is concern that cannabis may contribute to cardiovascular disease, but as of 2018[update], evidence of this relationship was unclear. Research in these events is complicated because cannabis is often used in conjunction with tobacco, and drugs such as alcohol and cocaine that are known to have cardiovascular risk factors. Smoking cannabis has also been shown to increase the risk of myocardial infarction by 4.8 times for the 60 minutes after consumption.
There is preliminary evidence that cannabis interferes with the anticoagulant properties of prescription drugs used for treating blood clots. As of 2019[update], the mechanisms for the anti-inflammatory and possible pain relieving effects of cannabis were not defined, and there were no governmental regulatory approvals or clinical practices for use of cannabis as a drug.
Emergency Department Visits
Emergency room (ER) admissions associated with cannabis use rose significantly from 2012 to 2016; adolescents from age 12-17 had the highest risk.  At one Colorado medical center following legalization, approximately two percent of ER admissions were classified as cannabis users. The symptoms of one quarter of these users were partially attributed to cannabis (a total of 2567 out of 449,031 patients); other drugs were sometimes involved. Of these cannabis admissions, one quarter were for acute psychiatric effects, primarily suicidal ideation, depression, and anxiety. An additional third of the cases were for gastrointestinal issues including Cannabinoid hyperemesis syndrome.
According to the United States Department of Health and Human Services, there were 455,000 emergency room visits associated with cannabis use in 2011. These statistics include visits in which the patient was treated for a condition induced by or related to recent cannabis use. The drug use must be "implicated" in the emergency department visit, but does not need to be the direct cause of the visit. Most of the illicit drug emergency room visits involved multiple drugs. In 129,000 cases, cannabis was the only implicated drug.
There is sufficient evidence of reproductive health harms from cannabis that its use when trying to conceive, during pregnancy, and while breastfeeding, is not advisable.
It has been recommended that cannabis use be stopped before and during pregnancy as it can result in negative outcomes for both the mother and baby. However, maternal use of marijuana during pregnancy does not appear to be associated with low birth weight or early delivery after controlling for tobacco use and other confounding factors.
Mechanism of action
The high lipid-solubility of cannabinoids results in their persisting in the body for long periods of time. Even after a single administration of THC, detectable levels of THC can be found in the body for weeks or longer (depending on the amount administered and the sensitivity of the assessment method). Investigators have suggested that this is an important factor in marijuana's effects, perhaps because cannabinoids may accumulate in the body, particularly in the lipid membranes of neurons.
Researchers confirmed that THC exerts its most prominent effects via its actions on two types of cannabinoid receptors, the CB1 receptor and the CB2 receptor, both of which are G protein-coupled receptors. The CB1 receptor is found primarily in the brain as well as in some peripheral tissues, and the CB2 receptor is found primarily in peripheral tissues, but is also expressed in neuroglial cells. THC appears to alter mood and cognition through its agonist actions on the CB1 receptors, which inhibit a secondary messenger system (adenylate cyclase) in a dose-dependent manner.
Via CB1 receptor activation, THC indirectly increases dopamine release and produces psychotropic effects. CBD also acts as an allosteric modulator of the μ- and δ-opioid receptors. THC also potentiates the effects of the glycine receptors. It is unknown if or how these actions contribute to the effects of cannabis.
The main psychoactive component of cannabis is THC, which is formed via decarboxylation of THCA from the application of heat. Raw leaf is not psychoactive because the cannabinoids are in the form of carboxylic acids.
Detection in body fluids
THC and its major (inactive) metabolite, THC-COOH, can be measured in blood, urine, hair, oral fluid or sweat using chromatographic techniques as part of a drug use testing program or a forensic investigation of a traffic or other criminal offense. The concentrations obtained from such analyses can often be helpful in distinguishing active use from passive exposure, elapsed time since use, and extent or duration of use. These tests cannot, however, distinguish authorized cannabis smoking for medical purposes from unauthorized recreational smoking. Commercial cannabinoid immunoassays, often employed as the initial screening method when testing physiological specimens for marijuana presence, have different degrees of cross-reactivity with THC and its metabolites. Urine contains predominantly THC-COOH, while hair, oral fluid and sweat contain primarily THC. Blood may contain both substances, with the relative amounts dependent on the recency and extent of usage.
The Duquenois–Levine test is commonly used as a screening test in the field, but it cannot definitively confirm the presence of cannabis, as a large range of substances have been shown to give false positives. Researchers at John Jay College of Criminal Justice reported that dietary zinc supplements can mask the presence of THC and other drugs in urine. However, a 2013 study conducted by researchers at the University of Utah School of Medicine refute the possibility of self-administered zinc producing false-negative urine drug tests.
Varieties and strains
CBD is a 5-HT1A receptor agonist, which is under laboratory research to determine if it has an anxiolytic effect. It is often claimed that sativa strains provide a more stimulating psychoactive high while indica strains are more sedating with a body high. However, this is disputed by researchers.
A 2015 review found that the use of high CBD-to-THC strains of cannabis showed significantly fewer positive symptoms, such as delusions and hallucinations, better cognitive function and both lower risk for developing psychosis, as well as a later age of onset of the illness, compared to cannabis with low CBD-to-THC ratios.
According to the United Nations Office on Drugs and Crime (UNODC), "the amount of THC present in a cannabis sample is generally used as a measure of cannabis potency." The three main forms of cannabis products are the flower/fruit, resin (hashish), and oil (hash oil). The UNODC states that cannabis often contains 5% THC content, resin "can contain up to 20% THC content", and that "Cannabis oil may contain more than 60% THC content."
A 2012 review found that the THC content in marijuana had increased worldwide from 1970 to 2009. It is unclear, however, whether the increase in THC content has caused people to consume more THC or if users adjust based on the potency of the cannabis. It is likely that the higher THC content allows people to ingest less tar. At the same time, CBD levels in seized samples have lowered, in part because of the desire to produce higher THC levels and because more illegal growers cultivate indoors using artificial lights. This helps avoid detection but reduces the CBD production of the plant.
Australia's National Cannabis Prevention and Information Centre (NCPIC) states that the buds (infructescences) of the female cannabis plant contain the highest concentration of THC, followed by the leaves. The stalks and seeds have "much lower THC levels". The UN states that the leaves can contain ten times less THC than the buds, and the stalks one hundred times less THC.
After revisions to cannabis scheduling in the UK, the government moved cannabis back from a class C to a class B drug. A purported reason was the appearance of high potency cannabis. They believe skunk accounts for between 70 and 80% of samples seized by police (despite the fact that skunk can sometimes be incorrectly mistaken for all types of herbal cannabis). Extracts such as hashish and hash oil typically contain more THC than high potency cannabis infructescences.
Laced cannabis and synthetic cannabinoids
The short term effects of cannabis can be altered if it has been laced with opioid drugs such as heroin or fentanyl. The added drugs are meant to enhance the psychoactive properties, add to its weight, and increase profitability, despite the increased danger of overdose.[note 4]
Dried flower buds (marijuana)
- Kief (yellow).jpg
A gram of kief
- Drop of cannabis oil.jpg
- Cannabis Butter.JPG
Infusion (dairy butter)
Marijuana or marihuana (herbal cannabis) consists of the dried flowers and fruits and subtending leaves and stems of the female Cannabis plant. This is the most widely consumed form, containing 3% to 20% THC, with reports of up to 33% THC. This is the stock material from which all other preparations are derived. Although herbal cannabis and industrial hemp derive from the same species and contain the psychoactive component (THC), they are distinct strains with unique biochemical compositions and uses. Hemp has lower concentrations of THC and higher concentrations of CBD, which gives lesser psychoactive effects.
Kief is a powder, rich in trichomes, which can be sifted from the leaves, flowers and fruits of cannabis plants and either consumed in powder form or compressed to produce cakes of hashish. The word "kif" derives from colloquial Arabic كيف Template:Transliteration, meaning pleasure.
Hashish (also spelled hasheesh, hashisha, or simply hash) is a concentrated resin cake or ball produced from pressed kief, the detached trichomes and fine material that falls off cannabis fruits, flowers and leaves. or from scraping the resin from the surface of the plants and rolling it into balls. It varies in color from black to golden brown depending upon purity and variety of cultivar it was obtained from. It can be consumed orally or smoked, and is also vaporized, or 'vaped'. The term "rosin hash" refers to a high quality solventless product obtained through heat and pressure.
Cannabinoids can be extracted from cannabis plant matter using high-proof spirits (often grain alcohol) to create a tincture, often referred to as "green dragon".:p17 Nabiximols is a branded product name from a tincture manufacturing pharmaceutical company.
Hash oil is a resinous matrix of cannabinoids obtained from the Cannabis plant by solvent extraction, formed into a hardened or viscous mass. Hash oil can be the most potent of the main cannabis products because of its high level of psychoactive compound per its volume, which can vary depending on the plant's mix of essential oils and psychoactive compounds. Butane and supercritical carbon dioxide hash oil have become popular in recent years.
There are many varieties of cannabis infusions owing to the variety of non-volatile solvents used. The plant material is mixed with the solvent and then pressed and filtered to express the oils of the plant into the solvent. Examples of solvents used in this process are cocoa butter, dairy butter, cooking oil, glycerine, and skin moisturizers. Depending on the solvent, these may be used in cannabis foods or applied topically.
Marihuana prensada ('pressed marijuana') is a cannabis-derived product widespread among the lower classes of South America, especially from the 90s. Locally it is known as "paraguayo" or "paragua", since its main producer is Paraguay. Marijuana is dried and mixed with binding agents that make it toxic and highly harmful to health. It is cut into the shape of bricks (ladrillos) and sold for a low price in Argentina, Brazil, Chile, Peru, Venezuela, and even the United States.
Cannabis is indigenous to Central Asia and the Indian subcontinent, and its uses for fabric and rope dates back to the Neolithic age in China and Japan. It is unclear when cannabis first became known for its psychoactive properties. The oldest archeological evidence for the burning of cannabis was found in Romanian kurgans dated 3,500 BC, and scholars suggest that the drug was first used in ritual ceremonies by Proto-Indo-European tribes living in the Pontic-Caspian steppe during the Chalcolithic period, a custom they eventually spread throughout western Eurasia during the Indo-European migrations. Some research suggests that the ancient Indo-Iranian drug soma, mentioned in the Vedas, sometimes contained cannabis. This is based on the discovery of a basin containing cannabis in a shrine of the second millennium BC in Turkmenistan.
Cannabis was known to the ancient Assyrians, who discovered its psychoactive properties through the Iranians. Using it in some religious ceremonies, they called it qunubu (meaning "way to produce smoke"), a probable origin of the modern word "cannabis". The Iranians also introduced cannabis to the Scythians, Thracians and Dacians, whose shamans (the kapnobataiTemplate:Snd"those who walk on smoke/clouds") burned cannabis infructescences to induce trance. The plant was used in China before 2800 BC, and found therapeutic use in India by 1000 BC, where it was used in food and drink, including bhang.
Cannabis has an ancient history of ritual use and has been used by religions around the world. The earliest evidence of cannabis smoking has been found in the 2,500-year-old tombs of Jirzankal Cemetery in the Pamir Mountains in Western China, where cannabis residue were found in burners with charred pebbles possibly used during funeral rituals. Hemp seeds discovered by archaeologists at Pazyryk suggest early ceremonial practices like eating by the Scythians occurred during the 5th to 2nd century BC, confirming previous historical reports by Herodotus. It was used by Muslims in various Sufi orders as early as the Mamluk period, for example by the Qalandars. Smoking pipes uncovered in Ethiopia and carbon-dated to around c. AD 1320 were found to have traces of cannabis.
Cannabis was introduced to the New World by the Spaniards in 1530–45. Following an 1836–1840 travel in North Africa and the Middle East, French physician Jacques-Joseph Moreau wrote on the psychological effects of cannabis use; he was a member of Paris' Club des Hashischins. In 1842, Irish physician William Brooke O'Shaughnessy, who had studied the drug while working as a medical officer in Bengal with the East India Company, brought a quantity of cannabis with him on his return to Britain, provoking renewed interest in the West. Examples of classic literature of the period featuring cannabis include Les paradis artificiels (1860) by Charles Baudelaire and The Hasheesh Eater (1857) by Fitz Hugh Ludlow.
Cannabis was criminalized in various countries beginning in the 19th century. The colonial government of Mauritius banned cannabis in 1840 over concerns on its effect on Indian indentured workers; the same occurred in Singapore in 1870. In the United States, the first restrictions on sale of cannabis came in 1906 (in the District of Columbia). Canada criminalized cannabis in The Opium and Narcotic Drug Act, 1923, before any reports of the use of the drug in Canada, but eventually legalized its consumption for recreational and medicinal purposes in 2018.
In 1925, a compromise was made at an international conference in The Hague about the International Opium Convention that banned exportation of "Indian hemp" to countries that had prohibited its use, and requiring importing countries to issue certificates approving the importation and stating that the shipment was required "exclusively for medical or scientific purposes". It also required parties to "exercise an effective control of such a nature as to prevent the illicit international traffic in Indian hemp and especially in the resin". In the United States in 1937, the Marihuana Tax Act was passed, and prohibited the production of hemp in addition to cannabis.
In 1972, the Dutch government divided drugs into more- and less-dangerous categories, with cannabis being in the lesser category. Accordingly, possession of Template:Convert/g or less was made a misdemeanor. Cannabis has been available for recreational use in coffee shops since 1976. Cannabis products are only sold openly in certain local "coffeeshops" and possession of up to Template:Convert/g for personal use is decriminalized, however: the police may still confiscate it, which often happens in car checks near the border. Other types of sales and transportation are not permitted, although the general approach toward cannabis was lenient even before official decriminalization.
In Uruguay, President Jose Mujica signed legislation to legalize recreational cannabis in December 2013, making Uruguay the first country in the modern era to legalize cannabis. In August 2014, Uruguay legalized growing up to six plants at home, as well as the formation of growing clubs (Cannabis social club), and a state-controlled marijuana dispensary regime.
As of 17 October 2018[update] when recreational use of cannabis was legalized in Canada, dietary supplements for human use and veterinary health products containing not more than 10 parts per million of THC extract were approved for marketing; Nabiximols (as Sativex) is used as a prescription drug in Canada.
The United Nations' World Drug Report stated that cannabis "was the world's most widely produced, trafficked, and consumed drug in the world in 2010", and estimated between 128 million and 238 million users globally in 2015.
Society, culture, legal status, and economics
Society and culture
Cannabis has been one of the most used psychoactive drugs in the world since the late 20th century, following only tobacco and alcohol in popularity. According to Vera Rubin, the use of cannabis has been encompassed by two major cultural complexes over time: a continuous, traditional folk stream, and a more circumscribed, contemporary configuration. The former involves both sacred and secular use, and is usually based on small-scale cultivation: the use of the plant for cordage, clothing, medicine, food, and a "general use as an euphoriant and symbol of fellowship." The second stream of expansion of cannabis use encompasses "the use of hemp for commercial manufacturers utilizing large-scale cultivation primarily as a fiber for mercantile purposes"; but it is also linked to the search for psychedelic experiences (which can be traced back to the formation of the Parisian Club des Hashischins).
Since the beginning of the 20th century, most countries have enacted laws against the cultivation, possession or transfer of cannabis. These laws have had an adverse effect on cannabis cultivation for non-recreational purposes, but there are many regions where handling of cannabis is legal or licensed. Many jurisdictions have lessened the penalties for possession of small quantities of cannabis so that it is punished by confiscation and sometimes a fine, rather than imprisonment, focusing more on those who traffic the drug on the black market.
In some areas where cannabis use had been historically tolerated, new restrictions were instituted, such as the closing of cannabis coffee shops near the borders of the Netherlands, and closing of coffee shops near secondary schools in the Netherlands. In Copenhagen, Denmark in 2014, mayor Frank Jensen discussed possibilities for the city to legalize cannabis production and commerce.
Some jurisdictions use free voluntary treatment programs and/or mandatory treatment programs for frequent known users. Simple possession can carry long prison terms in some countries, particularly in East Asia, where the sale of cannabis may lead to a sentence of life in prison or even execution. Political parties, non-profit organizations, and causes based on the legalization of medical cannabis and/or legalizing the plant entirely (with some restrictions) have emerged in such countries as China and Thailand.
In December 2012, the U.S. state of Washington became the first state to officially legalize cannabis in a state law (Washington Initiative 502) (but still illegal by federal law), with the state of Colorado following close behind (Colorado Amendment 64). On 1 January 2013, the first marijuana "club" for private marijuana smoking (no buying or selling, however) was allowed for the first time in Colorado. The California Supreme Court decided in May 2013 that local governments can ban medical marijuana dispensaries despite a state law in California that permits the use of cannabis for medical purposes. At least 180 cities across California have enacted bans in recent years.
In December 2013, Uruguay became the first country to legalize growing, sale and use of cannabis. After a long delay in implementing the retail component of the law, in 2017 sixteen pharmacies were authorized to sell cannabis commercially. On 19 June 2018, the Canadian Senate passed a bill and the Prime Minister announced the effective legalization date as 17 October 2018. Canada is the second country to legalize the drug.
In November 2015, Uttarakhand became the first state of India to legalize the cultivation of hemp for industrial purposes. Usage within the Hindu and Buddhist cultures of the Indian subcontinent is common, with many street vendors in India openly selling products infused with cannabis, and traditional medical practitioners in Sri Lanka selling products infused with cannabis for recreational purposes and well as for religious celebrations. Indian laws criminalizing cannabis date back to the colonial period. India and Sri Lanka have allowed cannabis to be taken in the context of traditional culture for recreational/celebratory purposes and also for medicinal purposes.
On 17 October 2018, Canada legalized cannabis for recreational adult use making it the second country in the world to do so after Uruguay and the first G7 nation. The Canadian Licensed Producer system aims to become the Gold Standard in the world for safe and secure cannabis production, including provisions for a robust craft cannabis industry where many expect opportunities for experimenting with different strains. Laws around use vary from province to province including age limits, retail structure, and growing at home.
As the drug has increasingly been seen as a health issue instead of criminal behavior, marijuana has also been legalized or decriminalized in: Czech Republic, Colombia, Ecuador, Portugal, South Africa and Canada. Medical marijuana was legalized in Mexico in mid-2017; legislators plan to legalize its recreational use by late 2019.
On 28 June 2021, Clarence Thomas, one of the U.S. Supreme Court's most conservative justices, possibly opened the door to federal legalization of cannabis in the United States when he wrote "A prohibition on interstate use or cultivation of marijuana may no longer be necessary or proper to support the federal government's piecemeal approach."
Legality by country
Currently, Uruguay and Canada are the only countries that have fully legalized the cultivation, consumption and bartering of recreational cannabis nationwide. In the United States, 19 states, 2 territories, and the District of Columbia have legalized the recreational use of cannabis – though the drug remains illegal at the federal level. Laws vary from state to state when it comes to the commercial sale. Court rulings in Georgia and South Africa have led to the legalization of cannabis consumption, but not legal sales. A policy of limited enforcement has also been adopted in many countries, in particular Spain and the Netherlands where the sale of cannabis is tolerated at licensed establishments. Contrary to popular belief, cannabis is not legal in the Netherlands but it has been decriminalized since the 1970s. In 2021, Malta was the first European Union member to legalize the use of cannabis for recreational purposes. Lebanon has recently become the first Arab country to legalize the plantation of cannabis for medical use.
Penalties for illegal recreational use ranges from confiscation or small fines to jail time and even death. In some countries citizens can be punished if they have used the drug in another country, including Singapore and South Korea.
United States Regulation and Prohibition of Cannabis
The Marihuana Tax Act of 1937 was one of the first measures to cannabis nationwide. This act was overturned in 1969 in Leary v. United States, and was repealed and replaced with the Controlled Substances Act by Congress the next year. Under the CSA cannabis was assigned a Schedule I classification, deemed to have a high potential for abuse and no accepted medical use – thereby prohibiting even medical use of the drug. The classification has remained since the CSA was first signed into law, despite multiple efforts to reschedule. In direct response, the Libertarian Party (United States) was one of the first major parties to endorse cannabis legalization in their first platform in 1972 which stated, "We favor the repeal of all laws creating "crimes without victims" now incorporated in Federal, state and local laws—such as laws on voluntary sexual relations, drug use, gambling, and attempted suicide." As cannabis prohibition continued into the 21st Century, the U.S. Marijuana Party was formed in 2002 as a single-issue party to end the war on drugs and to legalize cannabis. States have also begun to engage in the process of Nullification (U.S. Constitution) to override federal laws pertaining to cannabis. California started the trend by legalizing medicinal cannabis in 1996. Now, cannabis has been fully legalized for recreational use in 19 states with most states having some sort of state nullification of federal cannabis laws. In 1969, Gallup conducted a poll asking Americans whether "the use of marijuana should be legal" with only 12 percent at the time saying yes. In 1977, it rose to 28% and experienced a period of gradual increase thereafter. According to the latest poll, two-thirds of Americans think marijuana use should be legal.
Template:Global estimates of illicit drug users In 2013, between 128 and 232 million people used cannabis (2.7% to 4.9% of the global population between the ages of 15 and 65). Cannabis is by far the most widely used illicit substance.
Between 1973 and 1978, eleven states decriminalized marijuana. In 2001, Nevada reduced marijuana possession to a misdemeanor and since 2012, several other states have decriminalized and even legalized marijuana.
In 2018, almost half of the people in the United States had tried marijuana, 16% had used it in the past year, and 11% had used it in the past month. In 2014, daily marijuana use amongst US college students had reached its highest level since records began in 1980, rising from 3.5% in 2007 to 5.9% in 2014 and had surpassed daily cigarette use.
In the US, men are over twice as likely to use marijuana as women, and 18–29-year-olds are six times more likely to use as over-65-year-olds. In 2015, a record 44% of the US population has tried marijuana in their lifetime, an increase from 38% in 2013 and 33% in 1985.
Marijuana use in the United States is three times above the global average, but in line with other Western democracies. Forty-four percent of American 12th graders have tried the drug at least once, and the typical age of first-use is 16, similar to the typical age of first-use for alcohol but lower than the first-use age for other illicit drugs.
Sinsemilla (Spanish for "without seed") is the dried, seedless (i.e. parthenocarpic) infructescences of female cannabis plants. Because THC production drops off once pollination occurs, the male plants (which produce little THC themselves) are eliminated before they shed pollen to prevent pollination, thus inducing the development of parthenocarpic fruits gathered in dense infructescences. Advanced cultivation techniques such as hydroponics, cloning, high-intensity artificial lighting, and the sea of green method are frequently employed as a response (in part) to prohibition enforcement efforts that make outdoor cultivation more risky.
"Skunk" refers to several named strains of potent cannabis, grown through selective breeding and sometimes hydroponics. It is a cross-breed of Cannabis sativa and C. indica (although other strains of this mix exist in abundance). Skunk cannabis potency ranges usually from 6% to 15% and rarely as high as 20%. The average THC level in coffee shops in the Netherlands is about 18–19%.
The average levels of THC in cannabis sold in the United States rose dramatically between the 1970s and 2000. This is disputed for various reasons, and there is little consensus as to whether this is a fact or an artifact of poor testing methodologies. According to Daniel Forbes writing for slate.com, the relative strength of modern strains are likely skewed because undue weight is given to much more expensive and potent, but less prevalent, samples. Some suggest that results are skewed by older testing methods that included low-THC-content plant material such as leaves in the samples, which are excluded in contemporary tests. Others believe that modern strains actually are significantly more potent than older ones.
The price or street value of cannabis varies widely depending on geographic area and potency. Prices and overall markets have also varied considerably over time.
- In 1997, cannabis was estimated to be overall the number four value crop in the US, and number one or two in many states, including California, New York, and Florida. This estimate is based on a value to growers of ~60% of retail value, or Template:Convert/$/lb.
- In 2006, cannabis was estimated to have been a $36 billion market. This estimate has been challenged as exaggerated. The UN World Drug Report (2008) estimated that 2006 street prices in the US and Canada ranged from about US$8.8 to $25 per gram (approximately $250 to $700 per ounce), depending on quality. Typical U.S. retail prices were $10–15 per gram (approximately $280–420 per ounce).
- In 2017, the U.S. was estimated to constitute 90% of the worldwide $9.5 billion legal trade in cannabis.
After some U.S. states legalized cannabis, street prices began to drop. In Colorado, the price of smokable buds (infructescences) dropped 40 percent between 2014 and 2019, from $200 per ounce to $120 per ounce ($7 per gram to $4.19 per gram).
The European Monitoring Centre for Drugs and Drug Addiction reports that typical retail prices in Europe for cannabis varied from €2 to €20 per gram in 2008, with a majority of European countries reporting prices in the range €4–10.
Cannabis as a gateway drug
The gateway hypothesis states that cannabis use increases the probability of trying "harder" drugs. The hypothesis has been hotly debated as it is regarded by some as the primary rationale for the United States prohibition on cannabis use. A Pew Research Center poll found that political opposition to marijuana use was significantly associated with concerns about the health effects and whether legalization would increase marijuana use by children.
Some studies state that while there is no proof for the gateway hypothesis, young cannabis users should still be considered as a risk group for intervention programs. Other findings indicate that hard drug users are likely to be poly-drug users, and that interventions must address the use of multiple drugs instead of a single hard drug. Almost two-thirds of the poly drug users in the 2009–2010 Scottish Crime and Justice Survey used cannabis.
The gateway effect may appear due to social factors involved in using any illegal drug. Because of the illegal status of cannabis, its consumers are likely to find themselves in situations allowing them to acquaint with individuals using or selling other illegal drugs. Studies have shown that alcohol and tobacco may additionally be regarded as gateway drugs; however, a more parsimonious explanation could be that cannabis is simply more readily available (and at an earlier age) than illegal hard drugs. In turn, alcohol and tobacco are typically easier to obtain at an earlier age than is cannabis (though the reverse may be true in some areas), thus leading to the "gateway sequence" in those individuals, since they are most likely to experiment with any drug offered.
A related alternative to the gateway hypothesis is the common liability to addiction (CLA) theory. It states that some individuals are, for various reasons, willing to try multiple recreational substances. The "gateway" drugs are merely those that are (usually) available at an earlier age than the harder drugs. Researchers have noted in an extensive review that it is dangerous to present the sequence of events described in gateway "theory" in causative terms as this hinders both research and intervention.
In 2020, the National Institute on Drug Abuse released a study backing allegations that marijuana is a gateway to harder drugs, though not for the majority of marijuana users. The National Institute on Drug Abuse determined that marijuana use is "likely to precede use of other licit and illicit substances" and that "adults who reported marijuana use during the first wave of the survey were more likely than adults who did not use marijuana to develop an alcohol use disorder within 3 years; people who used marijuana and already had an alcohol use disorder at the outset were at greater risk of their alcohol use disorder worsening. Marijuana use is also linked to other substance use disorders including nicotine addiction." It also reported that "These findings are consistent with the idea of marijuana as a "gateway drug." However, the majority of people who use marijuana do not go on to use other, "harder" substances. Also, cross-sensitization is not unique to marijuana. Alcohol and nicotine also prime the brain for a heightened response to other drugs and are, like marijuana, also typically used before a person progresses to other, more harmful substances."
Cannabis research is challenging since the plant is illegal in most countries. Research-grade samples of the drug are difficult to obtain for research purposes, unless granted under authority of national regulatory agencies, such as the US Food and Drug Administration.
There are also other difficulties in researching the effects of cannabis. Many people who smoke cannabis also smoke tobacco. This causes confounding factors, where questions arise as to whether the tobacco, the cannabis, or both that have caused a cancer. Another difficulty researchers have is in recruiting people who smoke cannabis into studies. Because cannabis is an illegal drug in many countries, people may be reluctant to take part in research, and if they do agree to take part, they may not say how much cannabis they actually smoke.
- "Pot – Definition". Merriam-Webster Dictionary. http://www.merriam-webster.com/dictionary/pot.
- "Weed – Definition". Merriam-Webster Dictionary. http://www.merriam-webster.com/dictionary/weed.
- "Dope – Definition". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/dope.
- "Ganja – Definition". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/ganja.
- Ruiz, Pedro; Strain, Eric C. (2011). Substance Abuse: A Comprehensive Textbook. Lippincott Williams & Wilkins. p. 214. ISBN 978-1-60547-277-5. https://books.google.com/books?id=w4ZUJAdleTsC&pg=PA214.
- "Grass – Definition". Merriam-Webster Dictionary. http://www.merriam-webster.com/dictionary/grass.
- "Herb – Definition". Merriam-Webster Dictionary. http://www.merriam-webster.com/dictionary/herb.
- "Skunk – Definition". American Heritage Dictionary of the English Language. https://www.ahdictionary.com/word/search.html?q=skunk.
- "Mary Jane – Definition". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/Mary%20Jane.
- Madison Margolin (April 7, 2017). "'Kush' and '420' Are Now Officially in the Dictionary". Jane Street. https://janest.com/article/2017/04/07/kush-420-now-officially-dictionary/. Retrieved February 11, 2022.
- Vij (2012). Textbook Of Forensic Medicine And Toxicology: Principles And Practice. Elsevier India. p. 672. ISBN 978-81-312-1129-8. https://books.google.com/books?id=Vp8FAsnfGF4C&pg=PT672. See also article on Marijuana as a word.
- Spanish Word Histories and Mysteries: English Words That Come From Spanish. Houghton Mifflin Harcourt. 2007. p. 142. ISBN 978-0-547-35021-9. https://archive.org/details/spanishwordhisto00houg.
- Russo, Ethan B. (2013). Cannabis and Cannabinoids: Pharmacology, Toxicology, and Therapeutic Potential. Routledge. p. 28. ISBN 978-1-136-61493-4. https://books.google.com/books?id=qH-2Lj9x7L4C&pg=PP28.
- Newton, David E. (2013). Marijuana: a reference handbook. Santa Barbara, Calif.: ABC-CLIO. p. 7. ISBN 9781610691499. https://books.google.com/books?id=iWMf95ze8QEC&pg=PA7.
- "Cannabis and psychosis/schizophrenia: human studies". European Archives of Psychiatry and Clinical Neuroscience 259 (7): 413–31. October 2009. doi:10.1007/s00406-009-0024-2. PMC 2864503. PMID 19609589.
- "DrugFacts: Marijuana". National Institute on Drug Abuse, US National Institutes of Health. 1 December 2019. https://www.drugabuse.gov/publications/drugfacts/marijuana.
- Iversen, Leslie (2012). "How Cannabis Works in the Brain". In Castle, David; Murray, Robin M.; Cyril D'Souza, Deepak. Marijuana and Madness (Second Edition). Cambridge University Press.
- "Understanding the motivations for recreational marijuana use among adult Canadians". Substance Use & Misuse 43 (3–4): 539–72; discussion 573–79, 585–87. 2008. doi:10.1080/10826080701884911. PMID 18365950. http://cannabislink.ca/info/MotivationsforCannabisUsebyCanadianAdults-2008.pdf.
- "Marijuana: Factsheets: Appetite". Adai.uw.edu. http://adai.uw.edu/marijuana/factsheets/appetite.htm.
- Parker, Linda (2017). Cannabinoids and the Brain. MIT Press.
- Riviello, Ralph J. (2010). Manual of forensic emergency medicine : a guide for clinicians. Sudbury, Mass.: Jones and Bartlett Publishers. p. 41. ISBN 9780763744625. https://books.google.com/books?id=keng9ELAE2IC&pg=PA41.
- "Therapeutic Potential of Cannabinoids in Psychosis". Biological Psychiatry 79 (7): 604–12. April 2016. doi:10.1016/j.biopsych.2015.11.018. PMID 26852073. "Epidemiological data indicate a strong relationship between cannabis use and psychosis and schizophrenia beyond transient intoxication with an increased risk of any psychotic outcome in individuals who had ever used cannabis".
- Ortiz-Medina, MB; Perea, M; Torales, J; Ventriglio, A; Vitrani, G; Aguilar, L; Roncero, C (November 2018). "Cannabis consumption and psychosis or schizophrenia development.". The International Journal of Social Psychiatry 64 (7): 690–704. doi:10.1177/0020764018801690. PMID 30442059. "Cannabis use doubles the risk of developing psychosis in vulnerable people.".
- "Cannabis and Psychosis: a Critical Overview of the Relationship". Current Psychiatry Reports 18 (2): 12. February 2016. doi:10.1007/s11920-015-0657-y. PMID 26781550.
- "Cannabis and anxiety: a critical review of the evidence". Human Psychopharmacology 24 (7): 515–23. October 2009. doi:10.1002/hup.1048. PMID 19693792.
- "Commonly Abused Drugs Charts: Marijuana (Cannabis)". National Institute on Drug Abuse, US National Institutes of Health. 22 July 2019. https://www.drugabuse.gov/drugs-abuse/commonly-abused-drugs-charts#marijuana-cannabis-.
- "Status and Trend Analysis of Illict [sic] Drug Markets". World Drug Report 2015. p. 23. http://www.unodc.org/documents/wdr2015/WDR15_Drug_use_health_consequences.pdf. Retrieved 26 June 2015.
- "UNODC Statistics Online". https://data.unodc.org/.
- Booth, Martin (2004). Cannabis: A History. Picador. p. 36. ISBN 978-1-4090-8489-1. https://books.google.com/books?id=Mjn6sCiHoFIC&pg=PA36.
- Donahue, Michelle (12 June 2019). "Earliest evidence for cannabis smoking discovered in ancient tombs". National Geographic. https://www.nationalgeographic.com/culture/2019/06/earliest-evidence-cannabis-marijuana-smoking-china-tombs/.
- Ren, Meng; Tang, Zihua; Wu, Xinhua; Spengler, Robert; Jiang, Hongen; Yang, Yimin; Boivin, Nicole (2019). "The origins of cannabis smoking: Chemical residue evidence from the first millennium BCE in the Pamirs". Science Advances 5 (6): Figure 1. Bibcode 2019SciA....5.1391R. doi:10.1126/sciadv.aaw1391. PMC 6561734. PMID 31206023. https://www.researchgate.net/figure/Location-of-the-Jirzankal-Cemetery-A-Map-of-Eurasia-showing-the-location-of-the-Pamir_fig1_333734712.
- "Cannabis: Legal Status". Erowid.org. http://www.erowid.org/plants/cannabis/cannabis_law.shtml.
- UNODC. World Drug Report 2010. United Nations Publication. p. 198. http://www.unodc.org/unodc/en/data-and-analysis/WDR-2010.html. Retrieved 19 July 2010.
- Lemon, Jason (17 October 2018). "Where Is Weed Legal Around The World? You Can Now Officially Smoke Pot In Canada". Newsweek. https://www.newsweek.com/where-weed-legal-around-world-you-can-now-officially-smoke-pot-canada-1173623.
- "Marijuana Overview". http://www.ncsl.org/research/civil-and-criminal-justice/marijuana-overview.aspx.
- Farrugia, Claire (2021-12-14). "Cannabis bill approved in parliament, in first for Europe" (in en-gb). https://timesofmalta.com/articles/view/cannabis-bill-approved-in-parliament-in-first-for-europe.921310.
- Agren, David (2021-06-28). "Mexico supreme court strikes down laws that ban use of recreational marijuana" (in en). http://www.theguardian.com/world/2021/jun/28/mexicos-high-court-strikes-down-laws-that-ban-use-of-recreational-marijuana.
- "Medicinal cannabis". Australian Prescriber 38 (6): 212–15. December 2015. doi:10.18773/austprescr.2015.072. PMC 4674028. PMID 26843715.
- "What is medical marijuana?". July 2015. https://www.drugabuse.gov/publications/drugfacts/marijuana-medicine. "The term medical marijuana refers to using the whole unprocessed marijuana plant or its basic extracts to treat a disease or symptom."
- Backes, Michael (2014). Cannabis Pharmacy: The Practical Guide to Medical Marijuana. Hachette Books. p. 46. ISBN 978-1-60376-334-9. https://books.google.com/books?id=7z2FwBywoJ0C&pg=PT46.
- "Release the strains". Nature Medicine 21 (9): 963. September 2015. doi:10.1038/nm.3946. PMID 26340110.
- "The pharmacologic and clinical effects of medical cannabis". Pharmacotherapy 33 (2): 195–209. February 2013. doi:10.1002/phar.1187. PMID 23386598.
- "Cannabinoids for Medical Use: A Systematic Review and Meta-analysis". JAMA 313 (24): 2456–73. 23 June 2015. doi:10.1001/jama.2015.6358. PMID 26103030.
- "Medical Marijuana and Chronic Pain: a Review of Basic Science and Clinical Evidence". Current Pain and Headache Reports 19 (10): 50. October 2015. doi:10.1007/s11916-015-0524-x. PMID 26325482.
- "Adverse health effects of marijuana use". The New England Journal of Medicine 370 (23): 2219–27. June 2014. doi:10.1056/NEJMra1402309. PMC 4827335. PMID 24897085.
- "Health products containing cannabis or for use with cannabis: Guidance for the Cannabis Act, the Food and Drugs Act, and related regulations". Government of Canada. 11 July 2018. https://www.canada.ca/en/health-canada/services/drugs-health-products/drug-products/applications-submissions/guidance-documents/guidance-cannabis-act-food-and-drugs-act-related-regulations/document.html.
- Ainge Roy, Eleanor (11 December 2018). "New Zealand passes laws to make medical marijuana widely available". The Guardian. https://www.theguardian.com/world/2018/dec/11/new-zealand-passes-laws-to-make-medical-marijuana-widely-available.
- "Information on Cannabis Safety". https://www.safeaccessnow.org/cannabis_safety.
- Ernest Small (2016). Cannabis: A Complete Guide. CRC Press. ISBN 978-1-315-35059-2. https://books.google.com/books?id=oo2KDQAAQBAJ&pg=PT339.
- Onaivi, Emmanuel S.; Sugiura, Takayuki; Di Marzo, Vincenzo (2005). Endocannabinoids: The Brain and Body's Marijuana and Beyond. Taylor & Francis. p. 58. ISBN 978-0-415-30008-7. https://books.google.com/books?id=BxfLB4n3uoMC&pg=PA58.
- Curran, H. Valerie; Morgan, Celia J.A. (2014). "Desired and Undesired Effects of Cannabis on the Human Mind and Psychological Well-Being". In Pertwee, Roger G.. Handbook of Cannabis. Oxford University Press.
- Ashton, C.Heather (2001). "Pharmacology and Effects of Cannabis : A Brief Review". British Journal of Psychiatry 178 (2): 101–06. doi:10.1192/bjp.178.2.101. PMID 11157422.
- Mathre, Mary Lynn, ed (1997). Cannabis in Medical Practice: A Legal, Historical, and Pharmacological Overview of the Therapeutic Use of Marijuana. University of Virginia Medical Center. pp. 144–. ISBN 978-0-7864-8390-7. https://books.google.com/books?id=1AWGDhIOvk0C&pg=PA144.
- "Cannabinoid function in learning, memory and plasticity". Cannabinoids. Handbook of Experimental Pharmacology. 168. 2005. pp. 445–77. doi:10.1007/3-540-26573-2_15. ISBN 978-3-540-22565-2. PMID 16596784.
- "Medication-Associated Depersonalization Symptoms". http://www.medscape.com/viewarticle/468728.
- "[Depersonalization after withdrawal from cannabis usage"] (in he). Harefuah 144 (4): 249–51, 303. April 2005. PMID 15889607. http://www.ima.org.il/Ima/FormStorage/Type3/05-04-07.pdf.
- "Psychopharmacological effects of cannabis". British Journal of Hospital Medicine 43 (2): 114–16, 118–20, 122. February 1990. PMID 2178712.
- Souza, Rafael Sampaio Octaviano de; Albuquerque, Ulysses Paulino de; Monteiro, Júlio Marcelino; de Amorim, Elba Lúcia Cavalcanti (2008). "Brazilian Archives of Biology and Technology – Jurema-Preta (Mimosa tenuiflora [Willd.] Poir.): a review of its traditional use, phytochemistry and pharmacology". Brazilian Archives of Biology and Technology 51 (5): 937–47. doi:10.1590/S1516-89132008000500010.
- Courtwright, David (2001). Forces of Habit: Drugs and the Making of the Modern World. Harvard Univ. Press. ISBN 978-0-674-00458-0. https://books.google.com/books?id=GHqV3elHYvMC&q=Forces+of+Habit.
- Iversen, Leslie L. (2000). The Science of Marijuana. Oxford University Press. ISBN 978-0-19-515110-7. https://archive.org/details/scienceofmarijua00iver.
- Golub, Andrew (2012). The Cultural/Subcultural Contexts of Marijuana Use at the Turn of the Twenty-First Century. Routledge. p. 82. ISBN 978-1-136-44627-6. https://books.google.com/books?id=KFMtFv2tmbYC&pg=PA82.
- "Why Does Cannabis Have to be Heated?". https://patriotcare.org/why-cannabis-heated/.
- Tasman, Allan; Kay, Jerald; Lieberman, Jeffrey A.; First, Michael B.; Maj, Mario (2011). Psychiatry. John Wiley & Sons. p. 9. ISBN 978-1-119-96540-4. https://books.google.com/books?id=vVG7zz7eaxcC&pg=RA9-PT2217.
- Rosenthal, Ed (2002). Ask Ed: Marijuana Gold: Trash to Stash. Perseus Books Group. p. 15. ISBN 978-1-936807-02-4. https://books.google.com/books?id=obbSwmSB6okC&pg=PT15.
- "Cannabis and Cannabis Extracts: Greater Than the Sum of Their Parts?". Cannabis-med.org. http://www.cannabis-med.org/data/pdf/2001-03-04-7.pdf.
- Gieringer, Dale; Rosenthal, Ed (2008). Marijuana medical handbook: practical guide to therapeutic uses of marijuana. QUICK AMER Publishing Company. p. 182. ISBN 978-0-932551-86-3. https://books.google.com/books?id=OuAHxDKcpS8C&pg=PA182.
- "Sativex Oral Mucosal Spray Public Assessment Report. Decentralized Procedure.". United Kingdom Medicines and Healthcare Products Regulatory Agency. p. 93. http://www.mhra.gov.uk/home/groups/par/documents/websiteresources/con084961.pdf. "There is clear evidence that recreational cannabis can produce a transient toxic psychosis in larger doses or in susceptible individuals, which is said to characteristically resolve within a week or so of absence (Johns 2001). Transient psychotic episodes as a component of acute intoxication are well-documented (Hall et al 1994)"
- Hunt, Katie (17 March 2020). "Single cannabis joint linked with temporary psychiatric symptoms, review finds". CNN. https://www.cnn.com/2020/03/17/health/cannabis-psychiatric-symptoms-wellness/index.html.
- "Adverse effects of cannabis". Lancet 352 (9140): 1611–16. November 1998. doi:10.1016/S0140-6736(98)05021-1. PMID 9843121.
- Oltmanns, Thomas; Emery, Robert (2015). Abnormal Psychology. New Jersey: Pearson. p. 294. ISBN 978-0205970742.
- Abuse, National Institute on Drug. "Does marijuana use affect driving?". https://www.drugabuse.gov/publications/research-reports/marijuana/does-marijuana-use-affect-driving.
- "Marijuana use and motor vehicle crashes". Epidemiologic Reviews 34 (1): 65–72. 4 October 2011. doi:10.1093/epirev/mxr017. PMC 3276316. PMID 21976636.
- "The effects of cannabis intoxication on motor vehicle collision revisited and revised". Addiction 111 (8): 1348–59. August 2016. doi:10.1111/add.13347. PMID 26878835. https://zenodo.org/record/897625.
- "What has research over the past two decades revealed about the adverse health effects of recreational cannabis use?". Addiction 110 (1): 19–35. January 2015. doi:10.1111/add.12703. PMID 25287883. https://espace.library.uq.edu.au/view/UQ:346328/Hall_2014_20ycann_OA_post.pdf.
- Hall, Wayne; Pacula, Rosalie Liccardo (2003). Cannabis Use and Dependence: Public Health and Public Policy. Cambridge University Press. p. 38. ISBN 978-0-521-80024-2. https://archive.org/details/CannabisUseAndDependence.
- Barceloux, Donald G. (2012). "Chapter 60: Marijuana (Cannabis sativa L.) and synthetic cannabinoids". Medical Toxicology of Drug Abuse: Synthesized Chemicals and Psychoactive Plants. John Wiley & Sons. pp. 910–. ISBN 978-1-118-10605-1. https://books.google.com/books?id=9JLiJcjdqkcC&pg=PA910. Retrieved 14 July 2013.
- Wong, Kei U.; Baum, Carl R. (November 2019). "Acute Cannabis Toxicity" (in en-US). Pediatric Emergency Care 35 (11): 799–804. doi:10.1097/PEC.0000000000001970. ISSN 0749-5161. PMID 31688799. https://dx.doi.org/10.1097/PEC.0000000000001970.
- Claudet, Isabelle; Le Breton, Mathilde; Bréhin, Camille; Franchitto, Nicolas (April 2017). "A 10-year review of cannabis exposure in children under 3-years of age: do we need a more global approach?". European Journal of Pediatrics 176 (4): 553–56. doi:10.1007/s00431-017-2872-5. ISSN 1432-1076. PMID 28210835. https://pubmed.ncbi.nlm.nih.gov/28210835/.
- "Cannabis as a cause of death: A review". Forensic Sci Int 298: 298–306. May 2019. doi:10.1016/j.forsciint.2019.03.007. PMID 30925348.
- "The emergency department care of the cannabis and synthetic cannabinoid patient: a narrative review". Int J Emerg Med 14 (1): 10. February 2021. doi:10.1186/s12245-021-00330-3. PMC 7874647. PMID 33568074.
- "Development of a rational scale to assess the harm of drugs of potential misuse". Lancet 369 (9566): 1047–53. March 2007. doi:10.1016/s0140-6736(07)60464-4. PMID 17382831.
- "The effects of cannabis on memory function in users with and without psychotic disorder: findings from a combined meta-analysis". Psychological Medicine 46 (1): 177–88. January 2016. doi:10.1017/S0033291715001646. PMID 26353818. https://epub.ub.uni-muenchen.de/43978/.
- "Residual effects of cannabis use on neurocognitive performance after prolonged abstinence: a meta-analysis". Experimental and Clinical Psychopharmacology 20 (5): 420–29. October 2012. doi:10.1037/a0029117. PMID 22731735. "Therefore, results indicate evidence for small neurocognitive effects that persist after the period of acute intoxication...As hypothesized, the meta-analysis conducted on studies eval- uating users after at least 25 days of abstention found no residual effects on cognitive performance...These results fail to support the idea that heavy cannabis use may result in long-term, persistent effects on neuropsychological functioning.".
- "Nonacute (residual) neuropsychological effects of cannabis use: a qualitative analysis and systematic review". Journal of Clinical Pharmacology 42 (S1): 48S–57S. November 2002. doi:10.1002/j.1552-4604.2002.tb06003.x. PMID 12412836.
- "An evidence based review of acute and long-term effects of cannabis use on executive cognitive functions". Journal of Addiction Medicine 5 (1): 1–8. March 2011. doi:10.1097/ADM.0b013e31820c23fa. PMC 3037578. PMID 21321675. "Cannabis appears to continue to exert impairing effects in executive functions even after 3 weeks of abstinence and beyond. While basic attentional and working memory abilities are largely restored, the most enduring and detectable deficits are seen in decision-making, concept formation and planning.".
- "Acute and Chronic Effects of Cannabinoids on Human Cognition-A Systematic Review". Biological Psychiatry 79 (7): 557–67. April 2016. doi:10.1016/j.biopsych.2015.12.002. PMID 26858214. http://ro.uow.edu.au/sspapers/2164.
- "Keep off the grass? Cannabis, cognition and addiction". Nature Reviews. Neuroscience 17 (5): 293–306. May 2016. doi:10.1038/nrn.2016.28. PMID 27052382. http://discovery.ucl.ac.uk/1489385/1/Curran%2520et%2520al%2520NRN-2016%2520pdf.pdf.
- "Weighing the Evidence: A Systematic Review on Long-Term Neurocognitive Effects of Cannabis Use in Abstinent Adolescents and Adults". Neuropsychology Review 26 (2): 186–222. June 2016. doi:10.1007/s11065-016-9316-2. PMID 27125202.
- "Quality of life and recreational cannabis use". The American Journal on Addictions 26 (1): 8–25. January 2017. doi:10.1111/ajad.12486. PMID 28000973.
- Yücel, M; Lorenzetti, V; Suo, C; Zalesky, A; Fornito, A; Takagi, M J; Lubman, D I; Solowij, N (January 2016). "Hippocampal harms, protection and recovery following regular cannabis use". Translational Psychiatry 6 (1): e710–. doi:10.1038/tp.2015.201. PMC 5068875. PMID 26756903.
- "Is cannabis neurotoxic for the healthy brain? A meta-analytical review of structural brain alterations in non-psychotic users". Psychiatry and Clinical Neurosciences 67 (7): 483–92. November 2013. doi:10.1111/pcn.12085. PMID 24118193.
- "Structural and functional imaging studies in chronic cannabis users: a systematic review of adolescent and adult findings". PLOS ONE 8 (2): e55821. 2013. Bibcode 2013PLoSO...855821B. doi:10.1371/journal.pone.0055821. PMC 3563634. PMID 23390554. "The most consistently reported brain alteration was reduced hippocampal volume which was shown to persist even after several months of abstinence in one study and also to be related to the amount of cannabis use Other frequently reported morphological brain alterations related to chronic cannabis use were reported in the amygdala the cerebellum and the frontal cortex...These findings may be interpreted as reflecting neuroadaptation, perhaps indicating the recruitment of additional regions as a compensatory mechanism to maintain normal cognitive performance in response to chronic cannabis exposure, particularly within the prefrontal cortex area.".
- "Brain Imaging Studies on the Cognitive, Pharmacological and Neurobiological Effects of Cannabis in Humans: Evidence from Studies of Adult Users". Current Pharmaceutical Design 22 (42): 6366–79. 2016. doi:10.2174/1381612822666160822151323. PMID 27549374. "1) The studies reviewed so far demonstrated that chronic cannabis use has been associated with a volume reduction of the hippocampus...3) The overall conclusion arising from these studies is that recent cannabis users may experience subtle neurophysiological deficits while performing on working memory tasks, and that they compensate for these deficits by "working harder" by using additional brain regions to meet the demands of the task.".
- "Residual effects of cannabis use in adolescent and adult brains – A meta-analysis of fMRI studies". Neuroscience and Biobehavioral Reviews 88: 26–41. May 2018. doi:10.1016/j.neubiorev.2018.03.008. PMID 29535069. https://kclpure.kcl.ac.uk/portal/files/88441182/Residual_effects_of_cannabis_BLEST_HOPLEY_Publishedonline10March2018_GREEN_AAM_CC_BY_NC_ND_.pdf. "This may reflect the multitude of cognitive tasks employed by the various studies included in these meta-analyses, all of which involved performing a task thereby requiring the participant to reorient their attention and attempt to solve the problem at hand and suggest that greater engagement of this region indicates less efficient cognitive performance in cannabis users in general, irrespective of their age.".
- "Endocannabinoid signalling in reward and addiction". Nature Reviews. Neuroscience 16 (10): 579–94. October 2015. doi:10.1038/nrn4004. PMC 4652927. PMID 26373473.
- "Cannabis Addiction and the Brain: a Review". Journal of Neuroimmune Pharmacology 13 (4): 438–52. March 2018. doi:10.1007/s11481-018-9782-9. PMC 6223748. PMID 29556883.
- "Effect of cannabis on glutamate signalling in the brain: A systematic review of human and animal evidence". Neuroscience and Biobehavioral Reviews 64: 359–81. May 2016. doi:10.1016/j.neubiorev.2016.03.010. PMID 26987641. https://kclpure.kcl.ac.uk/portal/en/publications/effect-of-cannabis-on-glutamate-signalling-in-the-brain-a-systematic-review-of-human-and-animal-evidence(9b3d72d2-d3ae-44a6-b9a5-4c13e9690b9d).html.
- "Adverse health effects of non-medical cannabis use". Lancet 374 (9698): 1383–91. October 2009. doi:10.1016/s0140-6736(09)61037-0. PMID 19837255.
- "Can cannabis be considered a substitute medication for alcohol?". Alcohol and Alcoholism 49 (3): 292–98. 2014. doi:10.1093/alcalc/agt182. PMC 3992908. PMID 24402247.
- "Meta-analysis of the Association Between the Level of Cannabis Use and Risk of Psychosis". Schizophrenia Bulletin 42 (5): 1262–69. September 2016. doi:10.1093/schbul/sbw003. PMC 4988731. PMID 26884547.
- "Cannabis use and risk of psychotic or affective mental health outcomes: a systematic review". Lancet 370 (9584): 319–28. July 2007. doi:10.1016/S0140-6736(07)61162-3. PMID 17662880. http://orca.cf.ac.uk/619/1/Appendix%201%20%28search%20strategy%29%20Cannabis%20use%20and%20risk%20of%20developing%20psychotic%20or%20affective%20mental%20health%20outcomes%20a%20systematic%20review.pdf.
- "Cannabis as a risk factor for psychosis: systematic review". Journal of Psychopharmacology 19 (2): 187–94. March 2005. doi:10.1177/0269881105049040. PMID 15871146.
- "Cannabis use and earlier onset of psychosis: a systematic meta-analysis". Archives of General Psychiatry 68 (6): 555–61. June 2011. doi:10.1001/archgenpsychiatry.2011.5. PMID 21300939.
- "Assessing evidence for a causal link between cannabis and psychosis: a review of cohort studies". The International Journal on Drug Policy 21 (1): 10–19. January 2010. doi:10.1016/j.drugpo.2009.09.001. PMID 19783132. "The contentious issue of whether cannabis use can cause serious psychotic disorders that would not otherwise have occurred cannot be answered based on the existing data".
- Carey, Benedict (17 January 2019). "Does Marijuana Use Cause Schizophrenia?". The New York Times. https://www.nytimes.com/2019/01/17/health/cannabis-marijuana-schizophrenia.html.
- "The association between cannabis use and depression: a systematic review and meta-analysis of longitudinal studies". Psychological Medicine 44 (4): 797–810. March 2014. doi:10.1017/S0033291713001438. PMID 23795762.
- "A positive association between anxiety disorders and cannabis use or cannabis use disorders in the general population – a meta-analysis of 31 studies". BMC Psychiatry 14: 136. May 2014. doi:10.1186/1471-244X-14-136. PMC 4032500. PMID 24884989.
- Gobbi, Gabriella; Atkin, Tobias; Zytynski, Tomasz; Wang, Shouao; Askari, Sorayya; Boruff, Jill; Ware, Mark; Marmorstein, Naomi et al. (13 February 2019). "Cannabis Use in Adolescence and Risk of Depression, Anxiety, and Suicidality in Young Adulthood". JAMA Psychiatry 76 (4): 426–34. doi:10.1001/jamapsychiatry.2018.4500. PMC 6450286. PMID 30758486.
- Black, Nicola; Stockings, Emily; Campbell, Gabrielle; Tran, Lucy T.; Zagic, Dino; Hall, Wayne D.; Farrell, Michael; Degenhardt, Louisa (December 2019). "Cannabinoids for the treatment of mental disorders and symptoms of mental disorders: a systematic review and meta-analysis". The Lancet. Psychiatry 6 (12): 995–1010. doi:10.1016/S2215-0366(19)30401-8. PMC 6949116. PMID 31672337.
- VanDolah, Harrison J.; Bauer, Brent A.; Mauck, Karen F. (September 2019). "Clinicians' Guide to Cannabidiol and Hemp Oils". Mayo Clinic Proceedings 94 (9): 1840–51. doi:10.1016/j.mayocp.2019.01.003. PMID 31447137.
- "Medical consequences of marijuana use: a review of current literature". Current Psychiatry Reports 15 (12): 419. December 2013. doi:10.1007/s11920-013-0419-7. PMID 24234874. https://zenodo.org/record/1232874.
- "Can cannabis be considered a substitute medication for alcohol?". Alcohol and Alcoholism 49 (3): 292–98. 8 January 2014. doi:10.1093/alcalc/agt182. PMC 3992908. PMID 24402247.
- Armentano, Paul (5 February 2019). "Marijuana access is associated with decreased use of alcohol, tobacco and other prescription drugs". The Hill. https://thehill.com/opinion/healthcare/428593-marijuana-access-is-associated-with-decreased-use-of-alcohol-tobacco-and.
- Nourbakhsh, Mahra; Miller, Angela; Gofton, Jeff; Jones, Graham; Adeagbo, Bamidele (2019). "Cannabinoid Hyperemesis Syndrome: Reports of Fatal Cases" (in en). Journal of Forensic Sciences 64 (1): 270–74. doi:10.1111/1556-4029.13819. ISSN 1556-4029. PMID 29768651. https://onlinelibrary.wiley.com/doi/abs/10.1111/1556-4029.13819.
- Rudavsky, Shari. "He loved weed. Then the vomiting began. Months later, he died" (in en-US). https://www.usatoday.com/story/news/nation/2019/09/20/indiana-boy-17-died-smoking-weed-chs-blame-what-chs/2387571001/.
- Maisto, Stephen; Galizio, Mark; Connors, Gerard (2014). Drug Use and Abuse. Cengage Learning. p. 278. ISBN 978-1-305-17759-8. https://books.google.com/books?id=5F08AwAAQBAJ&pg=PA278.
- "Marijuana: respiratory tract effects". Clinical Reviews in Allergy & Immunology 46 (1): 65–81. February 2014. doi:10.1007/s12016-013-8374-y. PMID 23715638.
- "Effects of marijuana smoking on pulmonary function and respiratory complications: a systematic review". Archives of Internal Medicine 167 (3): 221–28. February 2007. doi:10.1001/archinte.167.3.221. PMC 2720277. PMID 17296876.
- "Cannabinoid Hyperemesis Syndrome: Diagnosis, Pathophysiology, and Treatment-a Systematic Review". Journal of Medical Toxicology 13 (1): 71–87. March 2017. doi:10.1007/s13181-016-0595-z. PMC 5330965. PMID 28000146.
- "Epidemiologic review of marijuana use and cancer risk". Alcohol 35 (3): 265–75. April 2005. doi:10.1016/j.alcohol.2005.04.008. PMID 16054989.
- "Does smoking cannabis cause cancer?". Cancer Research UK. 20 September 2010. http://cancerhelp.cancerresearchuk.org/about-cancer/cancer-questions/does-smoking-cannabis-cause-cancer.
- Tashkin, Donald (March 1997). "Effects of marijuana on the lung and its immune defenses". UCLA School of Medicine. http://www.ukcia.org/research/EffectsOfMarijuanaOnLungAndImmuneDefenses.php.
- "Cannabis smoking and respiratory health: consideration of the literature". Respirology 19 (5): 655–62. July 2014. doi:10.1111/resp.12298. PMID 24831571.
- "An epidemiologic review of marijuana and cancer: an update". Cancer Epidemiology, Biomarkers & Prevention 24 (1): 15–31. January 2015. doi:10.1158/1055-9965.EPI-14-1026. PMC 4302404. PMID 25587109.
- "Effects of marijuana smoking on the lung". Annals of the American Thoracic Society 10 (3): 239–47. June 2013. doi:10.1513/annalsats.201212-127fr. PMID 23802821.
- "Cannabis exposure and risk of testicular cancer: a systematic review and meta-analysis". BMC Cancer 15 (1): 897. November 2015. doi:10.1186/s12885-015-1905-6. PMC 4642772. PMID 26560314.
- "Head and neck cancer among marijuana users: a meta-analysis of matched case-control studies". Archives of Oral Biology 60 (12): 1750–55. December 2015. doi:10.1016/j.archoralbio.2015.09.009. PMID 26433192.
- "No smoke, no fire: What the initial literature suggests regarding vapourized cannabis and respiratory risk". Canadian Journal of Respiratory Therapy 51 (1): 7–9. 2015. PMC 4456813. PMID 26078621.
- Comorbidity of Mental and Physical Disorders. Karger Medical and Scientific Publishers. 2014. p. 88. ISBN 978-3-318-02604-7. https://books.google.com/books?id=_pDgBQAAQBAJ&pg=PA88.
- "Associations Between Marijuana Use and Cardiovascular Risk Factors and Outcomes: A Systematic Review". Annals of Internal Medicine 168 (3): 187–94. February 2018. doi:10.7326/M17-1548. PMC 6157910. PMID 29357394.
- "Adverse cardiovascular, cerebrovascular, and peripheral vascular effects of marijuana inhalation: what cardiologists need to know". The American Journal of Cardiology 113 (1): 187–90. January 2014. doi:10.1016/j.amjcard.2013.09.042. PMID 24176069.
- "Marijuana Use and Cardiovascular Disease". Cardiology in Review 24 (4): 158–62. 9 February 2016. doi:10.1097/CRD.0000000000000103. PMID 26886465.
- Greger, Jessica; Bates, Vernice; Mechtler, Laszlo; Gengo, Fran (2020). "A review of cannabis and interactions with anticoagulant and antiplatelet agents". The Journal of Clinical Pharmacology 60 (4): 432–38. doi:10.1002/jcph.1557. PMID 31724188.
- Shen, Jay J.; Shan, Guogen; Kim, Pearl C.; Yoo, Ji Won; Dodge-Francis, Carolee; Lee, Yong-Jae (2019). "Trends and Related Factors of Cannabis-Associated Emergency Department Visits in the United States: 2006–2014" (in en-US). Journal of Addiction Medicine 13 (3): 193–200. doi:10.1097/ADM.0000000000000479. ISSN 1932-0620. PMID 30418337. https://dx.doi.org/10.1097/ADM.0000000000000479.
- Shelton, Shelby K.; Mills, Eleanor; Saben, Jessica L.; Devivo, Michael; Williamson, Kayla; Abbott, Diana; Hall, Katelyn E.; Monte, Andrew A. (2020). "Why do patients come to the emergency department after using cannabis?". Clinical Toxicology (Philadelphia, Pa.) 58 (6): 453–59. doi:10.1080/15563650.2019.1657582. ISSN 1556-9519. PMC 7073292. PMID 31526057.
- "National Estimates of Drug-Related Emergency Department Visits". Drug Abuse Warning Network. U.S. Department of Health and Human Services. 2011. http://www.samhsa.gov/data/sites/default/files/DAWN2k11ED/DAWN2k11ED/DAWN2k11ED.pdf.
- "Effects of marijuana on reproductive health: preconception and gestational effects". Curr Opin Endocrinol Diabetes Obes 28 (6): 558–65. December 2021. doi:10.1097/MED.0000000000000686. PMC 8580253. PMID 34709212.
- American College of Obstetricians Gynecologists Committee on Obstetric Practice (July 2015). "Committee Opinion No. 637: Marijuana Use During Pregnancy and Lactation". Obstetrics and Gynecology 126 (1): 234–38. doi:10.1097/01.AOG.0000467192.89321.a6. PMID 26241291.
- "Prenatal exposure to cannabis and maternal and child health outcomes: a systematic review and meta-analysis". BMJ Open 6 (4): e009986. April 2016. doi:10.1136/bmjopen-2015-009986. PMC 4823436. PMID 27048634.
- "Maternal Marijuana Use and Adverse Neonatal Outcomes: A Systematic Review and Meta-analysis". Obstetrics and Gynecology 128 (4): 713–23. October 2016. doi:10.1097/AOG.0000000000001649. PMID 27607879.
- Hall, Wayne; Pacula, Rosalie Liccardo (2003). Cannabis Use and Dependence: Public Health and Public Policy. Cambridge University Press. p. 15. ISBN 978-0-521-80024-2. https://archive.org/details/CannabisUseAndDependence.
- Hollister, Leo E. (March 1986). "Health aspects of cannabis". Pharma Review 38 (38): 1–20. PMID 3520605. http://www.lycaeum.org/drugwar/marij1.html. Retrieved 17 February 2011.
- Iovanna, Juan; Ismailov, Uktam (2009). Pancreatology: From Bench to Bedside. Springer. p. 40. ISBN 978-3-642-00152-9. https://books.google.com/books?id=3B5dp9BXaKwC&pg=PA40.
- "Endocannabinoid signaling in the brain". Science 296 (5568): 678–82. April 2002. Bibcode 2002Sci...296..678W. doi:10.1126/science.1063545. PMID 11976437.
- "A brain on cannabinoids: the role of dopamine release in reward seeking". Cold Spring Harbor Perspectives in Medicine 2 (8): a012229. August 2012. doi:10.1101/cshperspect.a012229. PMC 3405830. PMID 22908200.
- "Cannabidiol is an allosteric modulator at mu- and delta-opioid receptors". Naunyn-Schmiedeberg's Archives of Pharmacology 372 (5): 354–61. February 2006. doi:10.1007/s00210-006-0033-x. PMID 16489449.
- "Delta9-tetrahydrocannabinol and endogenous cannabinoid anandamide directly potentiate the function of glycine receptors". Molecular Pharmacology 69 (3): 991–97. March 2006. doi:10.1124/mol.105.019174. PMID 16332990.
- "Cannabinoid potentiation of glycine receptors contributes to cannabis-induced analgesia". Nature Chemical Biology 7 (5): 296–303. May 2011. doi:10.1038/nchembio.552. PMC 3388539. PMID 21460829.
- Baselt, Randall Clint (2008). Disposition of Toxic Drugs and Chemicals in Man. Biomedical Publications. pp. 1513–18. ISBN 978-0-9626523-7-0.
- Shaw, Leslie M.; Kwong, Tai C. (2001). The Clinical Toxicology Laboratory: Contemporary Practice of Poisoning Evaluation. Amer. Assoc. for Clinical Chemistry. p. 51. ISBN 978-1-890883-53-9. https://books.google.com/books?id=pXvFGqz44pYC&pg=PA51.
- "The Non-Specificity of the Duquenois-Levine Field Test for Marijuana". https://www.researchgate.net/publication/266888426.
- "Zinc reduces the detection of cocaine, methamphetamine, and THC by ELISA urine testing". Journal of Analytical Toxicology 35 (6): 333–40. July 2011. doi:10.1093/anatox/35.6.333. PMID 21740689.
- "Elevated urine zinc concentration reduces the detection of methamphetamine, cocaine, THC and opiates in urine by EMIT". Journal of Analytical Toxicology 37 (9): 665–69. 10 July 2013. doi:10.1093/jat/bkt056. PMID 23843421.
- Marijuana and Medicine: Assessing The Science Base. Washington, D.C.: National Academy of Sciences Press. 1999. doi:10.17226/6376. ISBN 978-0-585-05800-9. PMID 25101425. https://www.nap.edu/catalog/6376/marijuana-and-medicine-assessing-the-science-base.
- Elliott, Steve. "The Ultimate Guide on Indicas vs. Sativas". https://herb.co/marijuana/news/indica-vs-sativa-whats-the-difference.
- "The Cannabis sativa Versus Cannabis indica Debate: An Interview with Ethan Russo, MD". Cannabis and Cannabinoid Research 1 (1): 44–46. 2016. doi:10.1089/can.2015.29003.ebr. PMC 5576603. PMID 28861479.
- "A systematic review of the antipsychotic properties of cannabidiol in humans". Schizophrenia Research 162 (1–3): 153–61. March 2015. doi:10.1016/j.schres.2015.01.033. PMID 25667194.
- "Why Does Cannabis Potency Matter?". United Nations Office on Drugs and Crime. 29 June 2009. http://www.unodc.org/unodc/en/frontpage/2009/June/why-does-cannabis-potency-matter.html.
- "Increasing delta-9-tetrahydrocannabinol (Δ-9-THC) content in herbal cannabis over time: systematic review and meta-analysis". Current Drug Abuse Reviews 5 (1): 32–40. March 2012. doi:10.2174/1874473711205010032. PMID 22150622.
- Smith, Dana (17 January 2014). "Cannabis and memory loss: dude, where's my CBD?". The Guardian. https://www.theguardian.com/science/blog/2014/jan/17/cannabis-memory-loss-cbd.
- "Cannabis Potency". National Cannabis Prevention and Information Centre. http://ncpic.org.au/ncpic/publications/factsheets/article/cannabis-potency.
- "BBC: Cannabis laws to be strengthened. May 2008 20:55 UK". BBC News. 7 May 2008. http://news.bbc.co.uk/1/hi/uk_politics/7386889.stm.
- "High-potency cannabis and the risk of psychosis". The British Journal of Psychiatry 195 (6): 488–91. December 2009. doi:10.1192/bjp.bp.109.064220. PMC 2801827. PMID 19949195.
- Hope, Christopher (6 February 2008). "Use of extra strong 'skunk' cannabis soars". The Daily Telegraph (London). https://www.telegraph.co.uk/news/uknews/1577798/Use-of-extra-strong-skunk-cannabis-soars.html. Template:Cbignore
- Doweiko, Harold (2011). Concepts of Chemical Dependency. Cengage Learning. p. 124. ISBN 978-1-133-17081-5. https://books.google.com/books?id=RWMIAAAAQBAJ&pg=PA124.
- "Fake Hanf: Ein Drogentrend schwappt in die Schweiz – was du darüber wissen musst" (in de). watson.ch. https://www.watson.ch/schweiz/international/986556231-fake-cannabis-ein-drogentrend-schwappt-in-die-schweiz-mit-folgen.
- "Fake Hanf: Tödliches Marihuana hat bereits 61 Menschen getötet" (in de). watson.ch. https://www.watson.ch/schweiz/drogen/165953741-fake-hanf-toedliches-marihuana-hat-bereits-61-menschen-getoetet.
- "Fake Hanf mit synthetischen Cannabinoiden besprüht – drugcom". www.drugcom.de. https://www.drugcom.de/news/fake-hanf-mit-synthetischen-cannabinoiden-besprueht/.
- "Tödlicher Fake Hanf – Chemisch behandelte Hanfblüten – niemand kann sie erkennen" (in de). 14 August 2020. https://www.srf.ch/news/schweiz/toedlicher-fake-hanf-chemisch-behandelte-hanfblueten-niemand-kann-sie-erkennen.
- "Growing Array of Street Drugs Now Laced with Fentanyl", MedPageToday, 17 July 2018
- "What Can Marijuana Be Laced With?", American Addiction Centers, updated 26 November 2018
- "Is the opioid epidemic now the fentanyl epidemic?" December 2018/https://web.archive.org/web/20181218145559/https://www.baltimoresun.com/news/opinion/oped/bs-ed-op-1207-fentanyl-opioid-20181206-story.html Archived December 18, 2018, at the Wayback Machine., The Baltimore Sun, 7 December 2018
- "Medical officials oppose effort to legalize recreational use of marijuana", State Journal-Register, (Springfield, IL), 15 December 2018
- Potter, Gary; Bouchard, Martin; Decorte, Tom (2013). World Wide Weed: Global Trends in Cannabis Cultivation and its Control (revised ed.). Ashgate Publishing, Ltd.. p. 17. ISBN 978-1-4094-9438-6. https://books.google.com/books?id=ENOhAgAAQBAJ&pg=PA17.
- Hall, Wayne; Pacula, Rosalie Liccardo (2003). Cannabis Use and Dependence: Public Health and Public Policy. Cambridge University Press. p. 13. ISBN 978-0-521-80024-2. https://archive.org/details/CannabisUseAndDependence.
- United Nations Office on Drugs and Crime (2009). Recommended Methods for the Identification and Analysis of Cannabis and Cannabis Products. United Nations Publications. p. 15. ISBN 978-92-1-148242-3. https://books.google.com/books?id=MLR3bFaUZj0C&pg=PA15.
- Houck, Max M. (2015). Forensic Chemistry. Elsevier Science. p. 131. ISBN 978-0-12-800624-5. https://books.google.com/books?id=POpDBAAAQBAJ&pg=PA131.
- Adler, Patricia A.; Adler, Peter; O'Brien, Patrick K. (2012). Drugs and the American Dream: An Anthology. John Wiley & Sons. pp. 330–. ISBN 978-0-470-67027-9. https://books.google.com/books?id=_s_9tfNlfGkC&pg=PA330.
- Mosher, Clayton J.; Akins, Scott M. (2013). Drugs and Drug Policy: The Control of Consciousness Alteration. Sage Publications. p. 17. ISBN 978-1-4833-2188-2. https://books.google.com/books?id=2UQXBAAAQBAJ&pg=PA17.
- "Hemp Facts". Naihc.org. http://www.naihc.org/hemp_information/hemp_facts.html.
- Earleywine, Mitch (2002). Understanding Marijuana: A New Look at the Scientific Evidence. Oxford University Press. p. 3. ISBN 978-0-19-988143-7. https://books.google.com/books?id=QUn92XLQqf8C&pg=PA3.
- Rosenthal, Ed (2002). Ask Ed : Marijuana Gold: Trash to Stash. QUICK AMER Publishing Company. p. 116. ISBN 978-0-932551-52-8. https://books.google.com/books?id=H_QDJ7CWf2sC&pg=PA116.
- "Kief". Cannabisculture.com. 9 March 2005. http://www.cannabisculture.com/articles/4220.html.
- Bukszpan, David (2012). Is That a Word?: From AA to ZZZ, the Weird and Wonderful Language of SCRABBLE. Chronicle Books. p. 94. ISBN 978-1-4521-0824-7. https://books.google.com/books?id=eA8vlPcMXTUC&pg=PA94.
- "Hashish". dictionary.reference.com. http://dictionary.reference.com/browse/Hashish.
- Slade, Desmond; Mehmedic, Zlato; Chandra, Suman; ElSohly, Mahmoud (2012). "Is cannabis becoming more potent?". In Castle, David; Murray, Robin M.; Cyril D'Souza, Deepak. Marijuana and Madness (Second Edition). Cambridge University Press. p. 35.
- Goldberg, Raymond (2012). Drugs Across the Spectrum (7th ed.). Cengage Learning. p. 255. ISBN 978-1-133-59416-1. https://books.google.com/books?id=U9TjZHWVGoIC&pg=PA255.
- Alchimia Blog, Rosin Hash
- Cohen, Jeffrey A.; Rudick, Richard A. (2011). Multiple Sclerosis Therapeutics. Cambridge University Press. p. 670. ISBN 978-1-139-50237-5. https://books.google.com/books?id=LxQkUu2tfXcC&pg=PA670.
- King, Leslie A. (2009). Forensic Chemistry of Substance Misuse: A Guide to Drug Control. Royal Society of Chemistry. p. 78. ISBN 978-0-85404-178-7. https://books.google.com/books?id=x9Z1QZ5NIEIC&pg=PA78.
- "Dabs – marijuana's explosive secret". Cnbc.com. 24 February 2014. https://www.cnbc.com/id/101445332.
- World Drug Report. United Nations Publications. 2009. p. 98. ISBN 9789211482409. https://archive.org/details/worlddrugreport20000unse.
- Alison Hallett for Wired. 20 February 2013 Hash Oil is Blowing Up Across the U.S. – Literally
- Kintz, Pascal (2014). Toxicological Aspects of Drug-Facilitated Crimes. Elsevier Science. p. 141. ISBN 978-0-12-416969-2. https://books.google.com/books?id=YgnUAgAAQBAJ&pg=PA141.
- McDonough, Elise (2012). The Official High Times Cannabis Cookbook: More Than 50 Irresistible Recipes That Will Get You High. Chronicle Books. p. 17. ISBN 978-1-4521-0133-0. https://books.google.com/books?id=W-vas6K75YYC&pg=PA17.
- Sociedad de Psiquiatría y Neurología de la infancia y la Adolescencia (2016) (in es). Marihuana: Consensos y evidencias sobre su impacto en la salud. Editorial Forja. pp. 35. ISBN 9789563382600. https://books.google.com/books?id=3dViDwAAQBAJ. Retrieved 17 July 2021.
- Trejos Rosero, Luis Fernando (2016) (in es). Fronteras : fuentes de conflicto y cooperación. Luis Fernando Trejos Rosero, Universidad del Norte. Departamento de Ciencia Política y Relaciones Internacionales. Barranquilla, Colombia. pp. 111. ISBN 978-958-741-689-3. OCLC 979988717. https://www.worldcat.org/oclc/979988717.
- Stuardo, S. (5 September 2015). "Marihuana prensada: El lado negro de la hierba canábica" (in es). BioBioChile. https://www.biobiochile.cl/noticias/2015/09/05/marihuana-prensada-el-lado-negro-de-la-hierba-canabica.shtml.
- Wicht, J. J. (1991) (in es). Por un Perú mejor: exposiciones y debates del Primer Programa de Alta Especialización para Parlamentarios. Universidad del Pacífico. Centro de Investigación, Asociación Acción y Pensamiento Democrático (Lima, Peru), Konrad-Adenauer-Stiftung. Internationales Institut. pp. 206. https://books.google.com/books?id=ecq-AAAAIAAJ. Retrieved 17 June 2021.
- Schultes, Richard Evans (1976). Hallucinogenic Plants. Illustrated by Elmer W. Smith. New York: Golden Press. p. 31. ISBN 978-0-307-24362-1. https://archive.org/details/hallucinogenicpl00schu_0/page/31.
- "Marijuana and the Cannabinoids", ElSohly (p. 8).
- Stafford, Peter G.; Bigwood, Jeremy (1992). Psychedelics Encyclopedia. Ronin Publishing. p. 157. ISBN 978-0-914171-51-5. https://books.google.com/books?id=o4_pLqCOyDsC&pg=PA157.
- Prehistoric Textiles: The Development of Cloth in the Neolithic and Bronze Ages with Special Reference to the Aegean. Princeton University Press. 1992. pp. 17.
- Anthony, David W. (2007) (in en). The Horse, the Wheel, and Language: How Bronze-Age Riders from the Eurasian Steppes Shaped the Modern World. Princeton University Press. pp. 362. ISBN 978-0-691-05887-0. https://books.google.com/books?id=mTxQmQEACAAJ.
- Ellens, J. Harold (2014) (in en). Seeking the Sacred with Psychoactive Substances: Chemical Paths to Spirituality and to God. ABC-CLIO. pp. 24, 31. ISBN 978-1440830884. https://books.google.com/books?id=nBvFBAAAQBAJ.
- Rudgley, Richard (1998). "Soma". The Encyclopedia of Psychoactive Substances. Little, Brown and Company. ISBN 978-0-349-11127-8. http://www.huxley.net/soma/index.html.
- Franck, Mel (1997). Marijuana Grower's Guide. Red Eye Press. p. 3. ISBN 978-0-929349-03-9.
- Rubin, Vera D. (1976). Cannabis and Culture. Campus Verlag. p. 305. ISBN 978-3-593-37442-0.
- Cunliffe, Barry W. (2001). The Oxford Illustrated History of Prehistoric Europe. Oxford University Press. p. 405. ISBN 978-0-19-285441-4.
- Schultes, Richard Evans (1976). Hallucinogenic Plants. Illustrated by Elmer W. Smith. New York: Golden Press. p. 34. ISBN 978-0-307-24362-1. https://archive.org/details/hallucinogenicpl00schu_0/page/34.
- Staelens, Stefanie (10 March 2015). "The Bhang Lassi Is How Hindus Drink Themselves High for Shiva". https://munchies.vice.com/en_us/article/kbx94a/httpmunchies-vice-comarticlesthe-bhang-lassi-is-how-hindus-drink-themselves-high-for-shiva.
- "The origins of cannabis smoking: Chemical residue evidence from the first millennium BCE in the Pamirs". Science Advances 5 (6): eaaw1391. June 2019. Bibcode 2019SciA....5.1391R. doi:10.1126/sciadv.aaw1391. PMC 6561734. PMID 31206023.
- Walton, Robert P. (1938). Marijuana, America's New Drug Problem. JB Lippincott. p. 6.
- Taymiyya, Ibn (2001) (in FR). Le haschich et l'extase. Beyrouth: Albouraq. ISBN 978-2-84161-174-4.
- Rubin, Vera (1975). Cannabis and Culture. Walter de Gruyter. pp. 77–. ISBN 978-3-11-081206-0. https://books.google.com/books?id=gCRNRGOhNA4C&pg=PA77. "Cannabis Smoking in 13th-14th Century Ethiopia: Chemical Evidence"
- Booth, Martin (2004). Cannabis: A History. Picador. pp. 38.
- David E. Newton (2017). Marijuana: A Reference Handbook, 2nd Edition. p. 325.
- Eileen Konieczny, Lauren Wilson (2018). Healing with CBD.
- Iversen, Leslie L. (2007). The Science of Marijuana. Oxford University Press. pp. 110–. ISBN 978-0-19-988693-7. https://books.google.com/books?id=sshsCAAAQBAJ&pg=PT110.
- A Collection of the Laws of Mauritius and Its Dependencies. By the authority of the Government. 1867. pp. 541–. https://books.google.com/books?id=0ktHAQAAMAAJ&pg=PA541.
- Bunyapraphatsōn, Nanthawan (1999). Medicinal and poisonous plants. Backhuys Publishers. p. 169. ISBN 978-90-5782-042-7. https://books.google.com/books?id=ifDwAAAAMAAJ.
- "Statement of Dr. William C. Woodward". Drug library. http://www.druglibrary.org/schaffer/hemp/taxact/woodward.htm. "The District of Columbia law, insofar as it relates to Cannabis, is a part of an act passed by Congress in 1906 entitled "An act to regulate the practice of pharmacy and the sale of poisons in the District of Columbia, and for other purposes", approved May 17, 1906, and originally published as 34 Statutes, 175, which is now to be found in the District Code, section 191 and following. It limits the sale of Cannabis, its derivatives and its preparations to pharmacists and persons who are authorized assistants to pharmacists."
- Template:Cite canlaw
- "Opium as an international problem". Baltimore: The Johns Hopkins Press. 1925. http://www.druglibrary.org/schaffer/history/e1920/willoughby.htm.
- Template:Google books
- Booth, Martin (2004). Cannabis: A History. Picador. pp. 338. ISBN 978-0-312-42494-7. https://books.google.com/books?id=O7AoY6ljSygC&pg=PA338.
- Michael Tonry (2015). Crime and Justice. A Review of Research. 44. University of Chicago Press. pp. 261–. ISBN 978-0-226-34102-6. https://books.google.com/books?id=TMauCgAAQBAJ&pg=PT261.
- Use drop-down menu on site to view Netherlands entry.), Eldd.emcdda.europa.eu, http://eldd.emcdda.europa.eu/html.cfm/index5174EN.html, retrieved 17 February 2011
- Drugs Policy in the Netherlands, Ukcia.org, http://www.ukcia.org/research/dutch.php, retrieved 17 February 2011
- "Amsterdam Will Ban Tourists from Pot Coffee Shops". Atlantic Wire. 27 May 2011. http://www.theatlanticwire.com/global/2011/05/amsterdam-ban-pot-sales-tourists/38248/.
- Dockterman, Eliana (29 June 2012). "Marijuana Now the Most Popular Drug in the World". Time NewsFeed (Time Inc). http://newsfeed.time.com/2012/06/29/marijuana-now-the-most-popular-drug-in-the-world/.
- "Factsheet". World Drug Report 2017. United Nation Office on Drugs and Crime (UNODC). https://www.unodc.org/wdr2017/index.html.
- Ayyagari, Shalini (2007). ""Hori Hai": A Festival of Colours!! (review)". Asian Music (Johns Hopkins University Press) 38 (2): 151–53. doi:10.1353/amu.2007.0029.
- Rubin, 1975. p. 1
- Rubin, 1975. p. 3
- Rubin, 1975. p. 4
- Levinson, David (2002). Encyclopedia of Crime and Punishment. Sage Publications. p. 572. ISBN 978-0-7619-2258-2. https://books.google.com/books?id=aiQ09D7nWxYC&pg=PA572.
- "Many Dutch coffee shops close as liberal policies change, Exaptica". Expatica.com. 27 November 2007. http://www.expatica.com/nl/leisure/arts_culture/many-dutch-coffee-shops-close-as-liberal-policies-change-46376.html.
- "43 Amsterdam coffee shops to close door", Radio Netherlands, Friday 21 November 2008 December 2008/https://web.archive.org/web/20081202130012/http://www.rnw.nl/internationaljustice/news/international/6061587/43-Amsterdam-coffee-shops-to-close-doors Archived December 2, 2008, at the Wayback Machine.
- O'Sullivan, Feargus (3 March 2014). "Why the Mayor of Copenhagen Wants to Get Into the Marijuana Business". Bloomberg.com. https://www.citylab.com/equity/2014/03/why-mayor-copenhagen-wants-get-marijuana-business/8527/.
- Johnston, Ian (5 January 2014). "As cannabis is widely legalised, China cashes in on an unprecedented boom". Independent. https://www.independent.co.uk/news/world/asia/as-cannabis-is-widely-legalised-china-cashes-in-on-an-unprecedented-boom-9039191.html.
- Liljas, Per (3 June 2017). "Could Thailand, which gave world the bong, legalise cannabis for medicinal use? After failed war on drugs, attitudes have softened". Post Magazine. http://www.scmp.com/magazines/post-magazine/long-reads/article/2097464/could-thailand-which-gave-world-bong-legalise.
- "Marijuana goes legal in Washington state amid mixed messages". Reuters. 7 December 2012. https://www.reuters.com/article/uk-usa-marijuana-washington-idUSLNE8B502120121207.
- Duke, Alan (8 November 2012). "2 states legalize pot, but don't 'break out the Cheetos' yet". CNN.com. http://www.cnn.com/2012/11/07/politics/marijuana-legalization/index.html.
- "Marijuana clubs ring in new year in Colorado as legalized pot smoking begins". Abcnews.go.com. 1 January 2013. https://abcnews.go.com/US/marijuana-clubs-ring-year-colorado-legalized-pot-smoking/story?id=18108083.
- Mintz, Horward (6 May 2013). "Medical pot: California Supreme Court allows cities to ban weed dispensaries". Marin Independent Journal. http://www.marinij.com/digitalfirstmedia/ci_23184556/.
- Baker, Vicky (11 December 2013). "Marijuana laws around the world: what you need to know". The Guardian. https://www.theguardian.com/travel/2013/dec/11/uruguay-marijuana-laws-around-world.
- Reuters (19 July 2017). "Uruguay pharmacies start selling cannabis straight to consumers". https://www.theguardian.com/world/2017/jul/19/uruguay-marijuana-sale-pharmacies.
- "Marijuana to be legal in Canada starting October 17, Trudeau confirms". 20 June 2018. https://globalnews.ca/news/4285946/marijuana-legal-date-october-17-canada-trudeau-confirms/.
- Sapra, Bani (20 June 2018). "Canada becomes second nation in the world to legalize marijuana". https://www.cnn.com/2018/06/20/health/canada-legalizes-marijuana/index.html.
- "Uttarakhand To Become First Indian State To Legalise Cannabis Cultivation" (in en). 27 November 2015. http://www.indiatimes.com/news/india/uttarakhand-to-become-first-indian-state-to-legalise-cannabis-cultivation-247769.html.
- "South Asia Regional Profile Report". https://www.unodc.org/pdf/india/publications/south_Asia_Regional_Profile_Sept_2005/13_srilanka.pdf.
- Alchimia Blog, Medical marijuana news, December 2015
- Butler, Patrick (17 October 2018). "Cannabis is legal in Canada – here's what you need to know". CBC. https://www.cbc.ca/news/canada/marijuana-faq-legalization-need-to-know-1.4862207/.
- Sapra, Bani (20 June 2018). "Canada becomes second nation in the world to legalize marijuana". CNN. https://www.cnn.com/2018/06/20/health/canada-legalizes-marijuana/index.html.
- "This Application Seems Rigorous. Are All These Hoops Necessary?". LicensedProducersCanada.com. 5 July 2018. https://licensedproducerscanada.ca/faq/application-seems-rigorous-hoops-necessary.
- "Will Craft Cannabis Growers in Canada Succeed Like Craft Brewers?". LicensedProducersCanada.com. October 2018. https://licensedproducerscanada.ca/faq/will-craft-cannabis-growers-in-canada-succeed-like-craft-brewers.
- Parliament of the Czech Republic (1998) (in cs), Explanatory Report to Act No. 112/1998 Coll., which amends the Act No. 140/1961 Coll., the Criminal Code, and the Act No. 200/1990 Coll., on misdemeanors, Prague "Podle čl. 36 Jednotné úmluvy o omamných látkách ze dne 31. března 1961 (č. 47/1965 Sb.) se signatáři zavazují k trestnímu postihu tam uvedených forem nakládání s drogami včetně jejich držby. Návrh upouští od dosavadní beztrestnosti držby omamných a psychotropních látek a jedů pro svoji potřebu. Dosavadní beztrestnost totiž eliminuje v řadě případů možnost postihu dealerů a distributorů drog."
- Castaneda, Jorge G. "The summit of muted intentions". aljazeera.com. http://www.aljazeera.com/indepth/opinion/2012/03/2012327125714281880.html.
- "Congreso aprobó, en último debate, uso medicinal de la marihuana". 25 May 2016. http://www.noticiasrcn.com/nacional-pais/congreso-aprobo-ultimo-debate-uso-medicinal-marihuana.
- "Dosis máximas de droga para consumo ya están vigentes" June 2013/https://web.archive.org/web/20130624025336/http://www.elcomercio.com/seguridad/Dosis-maximas-droga-consumo-vigentes_0_941905849.html Archived June 24, 2013, at the Wayback Machine. at El Comercio.com.
- "Ecuador: Aprueban tenencia de drogas para consumo" June 2013/https://web.archive.org/web/20130625023421/http://www.elnuevoherald.com/2013/06/21/1505650/ecuador-aprueban-tenencia-de-drogas.html Archived June 25, 2013, at the Wayback Machine. at El Nuevo Herald
- "Ecuador could regulate the drug industry". http://www.telegrafo.com.ec/english-bulletin/item/ecuador-could-regulate-drug-sales.html.
- "Drug policy profiles – Portugal". 1 June 2011. http://www.emcdda.europa.eu/system/files/publications/642/PolicyProfile_Portugal_WEB_Final_289201.pdf.
- Lindeque, Mia. "Dagga users celebrate following ConCourt ruling on private use" (in en). https://ewn.co.za/2018/09/18/dagga-users-celebrate-following-concourt-ruling-on-private-use.
- Williams, Sean (28 April 2019). "Mexico Aims to Legalize Recreational Marijuana Before October" (in en). https://www.fool.com/investing/2019/04/28/mexico-aims-to-legalize-recreational-marijuana-bef.aspx.
- Ley de Narcomenudeo November 2010/https://web.archive.org/web/20101130224127/http://www.elpensador.com.mx/2009/10/17/Ley-de-Narcomenudeo/ Archived November 30, 2010, at the Wayback Machine., El Pensador Template:In lang, 17 October 2009
- Mexico: The Law Against Small-Scale Drug Dealing. A Doubtful Venture, Jorge Hernández Tinajero & Carlos Zamudio Angles, Series on Legislative Reform of Drug Policies Nr. 3, November 2009
- Pete Williams (28 June 2021). "Clarence Thomas says federal laws against marijuana may no longer be necessary". https://www.nbcnews.com/politics/supreme-court/clarence-thomas-says-federal-laws-against-marijuana-may-no-longer-n1272524.
- Ross, Selena (6 June 2018). "All eyes on Canada as first G7 nation prepares to make marijuana legal". The Guardian. https://www.theguardian.com/world/2018/jun/06/all-eyes-on-canada-as-first-g7-nation-prepares-to-make-marijuana-legal.
- Sapra, Bani (20 June 2018). "Canada becomes second nation in the world to legalize marijuana". CNN. https://www.cnn.com/2018/06/20/health/canada-legalizes-marijuana/index.html.
- Smith, Tasha (5 June 2018). ""New Amsterdam" No More? Spain's Cannabis Clubs Fight to Stay Open". Merry Jane. https://merryjane.com/culture/spains-cannabis-social-clubs-feature-june-2018.
- Haines, Gavin (21 February 2017). "Everything you need to know about marijuana smoking in the Netherlands". The Telegraph. https://www.telegraph.co.uk/travel/destinations/europe/netherlands/amsterdam/articles/everything-you-need-to-know-about-smoking-marijuana-in-the-netherlands/. Template:Cbignore
- "The Legal Situation of Cannabis in the Netherlands". 20 May 2020. https://straininsider.com/legal-situation-cannabis-netherlands/.
- Bubola, Emma (15 December 2021). "Malta Becomes First E.U. Country to Legalize Marijuana". The New York Times. https://www.nytimes.com/2021/12/15/world/europe/malta-eu-marijuana-legalize.html. Template:Cbignore
- "Lebanon legalizes cannabis farming for medicinal use". Reuters. 21 April 2020. https://www.reuters.com/article/us-lebanon-crisis-cannabis/lebanon-legalizes-cannabis-farming-for-medicinal-use-idUSKCN2232YI.
- "Is Weed Legal in Japan? And Other Vacation Info for Cannabis Users". https://www.vice.com/en_us/article/wxexym/weed-legal-indonesia-bali-japan.
- "Here are the absolute worst places on earth to be caught with weed". https://thegrowthop.com/cannabis-news/here-are-the-absolute-worst-places-on-earth-to-be-caught-with-weed.
- "Bong arm of the law: South Korea says it will arrest citizens who smoke weed in Canada". 23 October 2018. https://www.theguardian.com/world/2018/oct/23/bong-arm-of-the-law-south-korea-says-it-will-arrest-citizens-who-smoke-weed-in-canada.
- "Why the US Made Marijuana Illegal". 31 August 2018. https://www.history.com/news/why-the-u-s-made-marijuana-illegal.
- For repeal, see section 1101(b)(3), Comprehensive Drug Abuse Prevention and Control Act of 1970, Pub. L. No. 91-513, 84 Stat. 1236, 1292 (Oct. 27, 1970) (repealing the Marihuana Tax Act which had been codified in Subchapter A of Chapter 39 of the Internal Revenue Code of 1954).
- The DEA: Four Decades of Impeding And Rejecting Science, Drug Policy Alliance / Multidisciplinary Associations for Psychedelic Studies, June 2014, https://www.drugpolicy.org/sites/default/files/DPA-MAPS_DEA_Science_Final.pdf
- Hudak, John; Wallack, Grace (October 2015), "Ending the U.S. government's war on medical marijuana research", Center for Effective Public Management at Brookings (The Brookings Institution), https://www.brookings.edu/wp-content/uploads/2016/06/Ending-the-US-governments-war-on-medical-marijuana-research.pdf
- "Libertarian Party Platform of 1972". 17 June 1972. https://www.presidency.ucsb.edu/documents/libertarian-party-platform-1972.
- "United States Marijuana Party". https://ballotpedia.org/United_States_Marijuana_Party.
- "US election: California voters approve marijuana for recreational use". BBC News. 10 November 2016. https://www.bbc.com/news/world-us-canada-37917472.
- "MAP OF MARIJUANA LEGALITY BY STATE". https://disa.com/map-of-marijuana-legality-by-state.
- "50 Years After Nixon's Commission Said Cops Should Stop Busting Pot Users, the Federal Ban Remains Unchanged". March 22, 2022. https://reason.com/2022/03/22/50-years-after-nixons-commission-said-cops-should-stop-busting-pot-users-the-federal-ban-remains-unchanged/?utm_medium=email.
- "Support for Legal Marijuana Holds at Record High of 68%". November 4, 2021. https://news.gallup.com/poll/356939/support-legal-marijuana-holds-record-high.aspx.
- Caulkins, Jonathan P.; Hawken, Angela; Kilmer, Beau; Kleiman, Mark A.R. (2012). Marijuana Legalization: What Everyone Needs to Know. Oxford University Press. p. 16. ISBN 978-0199913732. https://archive.org/details/marijuanalegaliz0000unse/page/16.
- Joshua, Clark Davis (2015). "The business of getting high: head shops, countercultural capitalism, and the marijuana legalization movement". The Sixties 8: 27–49. doi:10.1080/17541328.2015.1058480.
- "6 facts about marijuana". 22 November 2018. https://www.pewresearch.org/fact-tank/2019/11/22/facts-about-marijuana/.
- "Daily marijuana use among college students highest since 1980". The University Record. https://record.umich.edu/articles/daily-marijuana-use-among-college-students-highest-1980.
- McCarthy, Justin (22 July 2015). "More Than Four in 10 Americans Say They Have Tried Marijuana". Gallup. https://news.gallup.com/poll/184298/four-americans-say-tried-marijuana.aspx.
- "World Drug Report 2006". United Nations Office on Drugs and Crime. http://www.unodc.org/unodc/en/data-and-analysis/WDR-2006.html. Ch. 2.3.
- Turco, Bucky (25 September 2017). "Why is Weed Getting More Potent". Gizmodo. https://gizmodo.com/why-is-weed-getting-more-potent-1818662872.
- Forbes, Daniel (19 November 2002). "The Myth of Potent Pot". Slate.com. http://www.slate.com/id/2074151.
- "Cannabis: Wholesale, street prices and purity levels". UNODC.org. 2005. http://www.unodc.org/pdf/WDR_2005/volume_2_chap7_cannabis.pdf.
- "Report on U.S. Domestic Marijuana Production". NORML. http://norml.org/index.cfm?Group_ID=4444.
- "Marijuana Called Top U.S. Cash Crop". 2008 ABCNews Internet Ventures. 20 December 2006. https://abcnews.go.com/business/story?id=2735017&page=1.
- United Nations Office on Drugs and Crime (2008). World drug report. United Nations Publications. p. 268. ISBN 978-92-1-148229-4. http://www.unodc.org/documents/wdr/WDR_2008/WDR_2008_eng_web.pdf.
- Sharma, Rakesh (25 June 2019). "How Federal Legalization Could Transform The US Cannabis Market" (in en). https://www.investopedia.com/insights/how-federal-legalization-could-transform-us-cannabis-market/.
- Hughes, Trevor (23 May 2019). "As marijuana prices drop, growers push 'organic' cannabis – with a higher price tag" (in en). https://www.usatoday.com/story/news/2019/05/23/pot-growers-push-organic-cannabis-cleaner-option-but-buyers-remain-skeptical/1206364001/.
- European Monitoring Centre for Drugs and Drug Addiction (2008). Annual report: the state of the drugs problem in Europe. Luxembourg: Office for Official Publications of the European Communities. p. 38. ISBN 978-92-9168-324-6. http://www.emcdda.europa.eu/attachements.cfm/att_64227_EN_EMCDDA_AR08_en.pdf.
- "RAND study casts doubt on claims that marijuana acts as a "gateway" to the use of cocaine and heroin". RAND Corporation. 2 December 2002. https://www.rand.org/news/press.02/gateway.html.
- "Public Views of Marijuana – Legalization, Decriminalization, Concerns | Pew Research Center for the People and the Press". 2 April 2014. http://www.people-press.org/2014/04/02/section-2-views-of-marijuana-legalization-decriminalization-concerns/.
- Mosher, Clayton J.; Akins, Scott (2007). Drugs and Drug Policy: The Control of Consciousness Alteration. Sage Publications. p. 18. ISBN 978-0-7619-3007-5. https://books.google.com/books?id=aDMvoMxx0-IC&pg=PA18.
- Saitz, Richard (18 February 2003). "Is marijuana a gateway drug?". Journal Watch 2003 (218): 1. http://general-medicine.jwatch.org/cgi/content/full/2003/218/1.
- "Who are the new amphetamine users? A 10-year prospective study of young Australians". Addiction 102 (8): 1269–79. August 2007. doi:10.1111/j.1360-0443.2007.01906.x. PMID 17624977.
- "3 The Experience of Drug Users". 2009/10 Scottish Crime and Justice Survey: Drug Use. The Scottish Government. 21 January 2011. http://www.scotland.gov.uk/Publications/2011/01/21134813/7.
- "Reassessing the marijuana gateway effect". Addiction 97 (12): 1493–504. December 2002. doi:10.1046/j.1360-0443.2002.00280.x. PMID 12472629.
- "Marijuana Policy Project – FAQ". http://www.mpp.org/about/faq.html.
- "Cigarette smoking as a predictor of alcohol and other drug use by children and adolescents: evidence of the "gateway drug effect"". The Journal of School Health 63 (7): 302–06. September 1993. doi:10.1111/j.1746-1561.1993.tb06150.x. PMID 8246462.
- "Common liability to addiction and "gateway hypothesis": theoretical, empirical and evolutionary perspective". Drug and Alcohol Dependence 123 Suppl 1: S3–17. June 2012. doi:10.1016/j.drugalcdep.2011.12.018. PMC 3600369. PMID 22261179.
- "Marijuana Research Report:Is marijuana a gateway drug?". National Institute on Drug Abuse. July 2020. https://www.drugabuse.gov/publications/research-reports/marijuana/marijuana-gateway-drug.
- "Marijuana Research: Current restrictions on marijuana research are absurd". Scientific American. 22 November 2004. http://www.scientificamerican.com/article.cfm?id=marijuana-research. Retrieved 15 January 2013.
- "Challenges of marijuana research". Brain 129 (Pt 5): 1081–83. May 2006. doi:10.1093/brain/awl092. PMID 16627464.
- Jha, Alok (31 May 2012). "Ecstasy and cannabis should be freely available for study, says David Nutt". The Guardian. https://www.theguardian.com/science/2012/may/31/ecstasy-cannabis-study-david-nutt.
- "Medical Marijuana Policy in the United States". Stanford.edu. 15 May 2012. https://www.stanford.edu/group/hopes/cgi-bin/wordpress/2012/05/medical-marijuana-policy-in-the-united-states/#medical-marijuana-and-research.
- Conaboy, Chelsea (19 October 2012). "Research into marijuana's medical benefits limited; scientists cite challenge of studying an illegal drug". Boston Globe. https://www.bostonglobe.com/lifestyle/health-wellness/2012/10/18/research-into-marijuana-medical-benefits-limited-scientists-cite-challenge-studying-illegal-drug/f6Ydip4xF5VfFWEV9mpwYJ/story.html.
- "FDA and Cannabis: Research and Drug Approval Process". US Food and Drug Administration. 14 January 2020. https://www.fda.gov/news-events/public-health-focus/fda-and-cannabis-research-and-drug-approval-process.
- "Clinical correlates of co-occurring cannabis and tobacco use: a systematic review". Addiction 107 (8): 1404–17. August 2012. doi:10.1111/j.1360-0443.2012.03843.x. PMC 3377777. PMID 22340422.
- "Does smoking cannabis cause cancer?". Cancer Research UK (CRUK). 30 August 2017. http://www.cancerresearchuk.org/cancer-help/about-cancer/cancer-questions/does-smoking-cannabis-cause-cancer.
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