Effects of cannabis

A dried cannabis flower.

The effects of cannabis are caused by chemical compounds in the cannabis plant, including 113 different cannabinoids such as tetrahydrocannabinol (THC) and 120 terpenes,[1] which allow its drug to have various psychological and physiological effects on the human body. Different plants of the genus Cannabis contain different and often unpredictable concentrations of THC and other cannabinoids and hundreds of other molecules that have a pharmacological effect,[2][3] so that the final net effect cannot reliably be foreseen.

Acute effects while under the influence can sometimes include euphoria.[4][5] Although some assert that cannabidiol (CBD), another cannabinoid found in cannabis in varying amounts, may alleviate the adverse effects of THC that some users experience,[6] little is known about CBD effects on humans.[7][8] Cannabinoid receptor antagonists have previously been tested as antidotes for cannabis intoxication with success, reducing or eliminating the physiological and psychological effects of intoxication.[9] Some of these products are currently in development as cannabis antidotes.

In the United States, medical cannabis research is limited by federal restrictions.[10] Smoking any substance could possibly carry similar risks as smoking tobacco due to carcinogens in all smoke,[11] [12][13] and the ultimate conclusions on these factors are disputed.[14][15][16][17]

Cannabis use disorder is defined as a medical diagnosis in the fifth revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5).[18]

Chemistry

The structural formula of tetrahydrocannabinol.
Tetrahydrocannabivarin.
Cannabidiol.
Cannabinol.
Cannabivarin.
Cannabidivarin.

Cannabinoids and cannabinoid receptors

The most prevalent psychoactive substances in cannabis are cannabinoids, particularly THC. Some varieties, having undergone careful selection and growing techniques, can yield as much as 34% THC.[19] Another psychoactive cannabinoid present in Cannabis sativa is tetrahydrocannabivarin (THCV), but it is only found in small amounts and is a cannabinoid antagonist.[20]

There are similar compounds in cannabis that do not exhibit psychoactive response but are obligatory for functionality: cannabidiol (CBD), an isomer of THC; cannabivarin (CBV), an analog of cannabinol (CBN) with a different side chain, cannabidivarin (CBDV), an analog of CBD with a different side chain, and cannabinolic acid. CBD is believed to regulate the metabolism of THC by inactivating cytochrome P450 enzymes that metabolize drugs; one such mechanism is via generation of carbon monoxide (a pharmacologically active neurotransmitter) by upon metabolism of CBD.[21] THC is converted rapidly to 11-hydroxy-THC, which is also pharmacologically active, so the euphoria outlasts measurable THC levels in blood.[22]

Biochemical mechanisms in the brain

Cannabinoids usually contain a 1,1'-di-methyl-pyran ring, a variedly derivatized aromatic ring and a variedly unsaturated cyclohexyl ring and their immediate chemical precursors, constituting a family of about 60 bi-cyclic and tri-cyclic compounds. Like most other neurological processes, the effects of cannabis on the brain follow the standard protocol of signal transduction, the electrochemical system of sending signals through neurons for a biological response. It is now understood that cannabinoid receptors appear in similar forms in most vertebrates and invertebrates and have a long evolutionary history of 500 million years. The binding of cannabinoids to cannabinoid receptors decrease adenylyl cyclase activity, inhibit calcium N channels, and disinhibit K+A channels. There are at least two types of cannabinoid receptors (CB1 and CB2).[23]

Sustainability in the body

Most cannabinoids are lipophilic (fat soluble) compounds that are easily stored in fat, thus yielding a long elimination half-life relative to other recreational drugs. The THC molecule, and related compounds, are usually detectable in drug tests from 3 days up to 10 days according to Redwood Laboratories; long-term users can produce positive tests for two to three months after ceasing cannabis use (see drug test).[24]

Toxicities

When cannabis is smoked, blood levels of THC peak rapidly after a few minutes and then decline, although the psychotropic effects persist for longer. Edible forms of cannabis often contain several hundred milligrams of THC, much more than the 32mg of a typical cannabis cigarette. The rise of edible cannabis products has been responsible for a large increase of poisoning of children and young people: in American states which have legalized cannabis, emergency room admissions of such cases have typically doubled. Symptoms in children can include lethargy, sedation and seizure.[25]

Cannabis is suspected of being a potential contributory factor or direct cause of sudden death, due to the strain it can place on the cardiovascular system, or because of cannabinoid hyperemesis syndrome.[26]

THC, the principal psychoactive constituent of the cannabis plant, has an extremely low toxicity and the amount that can enter the body through the consumption of cannabis plants poses no threat of death. In dogs, the minimum lethal dose of THC is over 3 g/kg.[27]

According to the Merck Index,[28] the LD50 of THC (the dose which causes the death of 50% of individuals) is 1270 mg/kg for male rats and 730 mg/kg for female rats from oral consumption in sesame oil, and 42 mg/kg for rats from inhalation.[29]

It is important though to note that cannabinoids and other molecules present in cannabis can alter the metabolism of other drugs, especially due to competition for clearing metabolic pathways such as cytochromes CYP450,[30] thus leading to drug toxicities by medications that the person consuming cannabis may be taking.

A 2007 study found that while tobacco and cannabis smoke are quite similar, cannabis smoke contained higher amounts of ammonia, hydrogen cyanide, and nitrogen oxides, but lower levels of carcinogenic polycyclic aromatic hydrocarbons (PAHs).[31] This study found that directly inhaled cannabis smoke contained as much as 20 times as much ammonia and 5 times as much hydrogen cyanide as tobacco smoke and compared the properties of both mainstream and sidestream (smoke emitted from a smouldering 'joint' or 'cone') smoke.[31] Mainstream cannabis smoke was found to contain higher concentrations of selected polycyclic aromatic hydrocarbons (PAHs) than sidestream tobacco smoke.[31] However, other studies have found much lower disparities in ammonia and hydrogen cyanide between cannabis and tobacco, and that some other constituents (such as polonium-210, lead, arsenic, nicotine, and tobacco-specific nitrosamines) are either lower or non-existent in cannabis smoke.[32][33] A 2021 longitudinal study conducted among populations of HIV-positive and HIV-negative adults found that smoke-related carcinogenic toxicants and biomarkers detected in tobacco smokers were also detected in exclusive marijuana smokers, including carbon monoxide (CO), polycyclic aromatic hydrocarbons (PAHs), aldehydes (such as acrolein), acrylonitrile and acrylamide metabolites, but exposures are lower compared with tobacco or dual smokers.[34] Increased levels of acrolein exposure by tobacco smoking but not exclusive marijuana smoking were detected both in HIV-positive and HIV-negative adults, and contribute to increased diagnoses of cardiovascular diseases and respiratory diseases among tobacco smokers.[34]

Cannabis smoke contains thousands of organic and inorganic chemical compounds. This tar is chemically similar to that found in tobacco smoke or cigars.[35] Over fifty known carcinogens have been identified in cannabis smoke.[36] These include nitrosamines, reactive aldehydes, and polycylic hydrocarbons, including benz[a]pyrene.[37] Marijuana smoke was listed as a cancer agent in California in 2009.[38] A study by the British Lung Foundation published in 2012 identifies cannabis smoke as a carcinogen and also finds awareness of the danger is low compared with the high awareness of the dangers of smoking tobacco particularly among younger users. Other observations include possible increased risk from each cigarette; lack of research on the effect of cannabis smoke alone; low rate of addiction compared to tobacco; and episodic nature of cannabis use compared to steady frequent smoking of tobacco.[39] Professor David Nutt, a UK drug expert, points out that the study cited by the British Lung Foundation has been accused of both "false reasoning" and "incorrect methodology". Further, he notes that other studies have failed to connect cannabis with lung cancer, and accuses the BLF of "scaremongering over cannabis".[40]

Short-term effects

Difference between natural cannabinoids and THC A) THC B) CB-1 receptor C) Neurotransmitters D) Postsynaptic Receptors E) Cannabinoid.

When smoked, the short-term effects of cannabis manifest within seconds and are fully apparent within a few minutes,[41] typically lasting for 1–3 hours, varying by the person and the strain of cannabis.[42] After oral ingestion of cannabis, the onset of effect is delayed relative to smoking, taking 30 minutes to 2 hours, but the duration is prolonged due to continued slow absorption.[41] The duration of noticeable effects has been observed to diminish after prolonged, repeated use and the development of increased tolerance to cannabinoids.

Psychological effects

A man smoking cannabis in Kolkata, India.

The psychoactive effects of cannabis, known as a "high", are subjective and vary among persons and the method of use.

When THC enters the blood stream and reaches the brain, it binds to cannabinoid receptors. The endogenous ligand of these receptors is anandamide, the effects of which THC emulates. This agonism of the cannabinoid receptors results in changes in the levels of various neurotransmitters, especially dopamine and norepinephrine; neurotransmitters which are closely associated with the acute effects of cannabis ingestion, such as euphoria and anxiety. Some effects may include a general alteration of conscious perception, euphoria, feelings of well-being, relaxation or stress reduction, increased appreciation of the arts, including humor and music (especially discerning its various components/instruments), joviality, metacognition and introspection, enhanced recollection (episodic memory), increased sensuality, increased awareness of sensation, increased libido,[43] and creativity. Abstract or philosophical thinking, disruption of linear memory and paranoia or anxiety are also typical. Anxiety is the most commonly reported negative side effect of smoking marijuana. Between 20 and 30 percent of recreational users experience intense anxiety and/or panic attacks after smoking cannabis; however, some report anxiety only after not smoking cannabis for a prolonged period of time.[44] Inexperience and use in an unfamiliar environment are major contributing factors to this anxiety. Cannabidiol (CBD), another cannabinoid found in cannabis in varying amounts, has been shown to ameliorate the adverse effects of THC, including anxiety, that some consumers experience.[45]

Cannabis produces many other subjective effects, including an increased enjoyment of food taste and aroma, and marked distortions in the perception of time (where experiencing a "rush" of ideas can create the subjective impression of much time passing). 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 acute psychosis and dissociative states such as depersonalization[46][47] and derealization.[48]

Furthermore, even in those with no family history of psychosis, the administration of pure THC in clinical settings has been demonstrated to elicit transient psychotic symptoms.[49][50][51][52] Any episode of acute psychosis that accompanies cannabis use usually abates after six hours, but in rare instances, heavy users may find the symptoms continuing for many days.[53] If the episode is accompanied by aggression or sedation, physical restraint may be necessary.[53]

While psychoactive drugs are typically categorized as stimulants, depressants, or hallucinogens, cannabis exhibits a mix of all of these effects, perhaps leaning more towards hallucinogenic or psychedelic properties, though with other effects quite pronounced. THC is considered the primary active component of the cannabis plant. Scientific studies have suggested that other cannabinoids like CBD may also play a significant role in its psychoactive effects.[54][55][56]

Somatic effects

Bloodshot eye.

Some of the short-term physical effects of cannabis use include increased heart rate, dry mouth, reddening of the eyes (congestion of the conjunctival blood vessels), a reduction in intra-ocular pressure, muscle relaxation and a sensation of cold or hot hands and feet and / or flushed face.[57]

Electroencephalography or EEG shows somewhat more persistent alpha waves of slightly lower frequency than usual.[58] Cannabinoids produce a "marked depression of motor activity" via activation of neuronal cannabinoid receptors belonging to the CB1 subtype.[59]

Duration

Peak levels of cannabis-associated intoxication occur approximately 30 minutes after smoking it and last for several hours.[60]

Smoked

The total short-term duration of cannabis use when smoked depends on the potency, method of smoking – e.g. whether pure or in conjunction with tobacco – and how much is smoked. Peak levels of intoxication typically last an average of three to four hours.[60]

Oral

When taken orally (in the form of capsules, food, or drink), the psychoactive effects take longer to manifest and generally last longer, typically lasting for an average of four to six hours after consumption.[61] Oral ingestion use eliminates the need to inhale toxic combustion products created by smoking and therefore negates the risk of respiratory harm associated with cannabis smoking.

Effects on driving

While several studies have shown increased risk associated with cannabis use by drivers, other studies have not found increased risk.[62] Cannabis usage has been shown in some studies to have a negative effect on driving ability.[63] The British Medical Journal indicated that "drivers who consume cannabis within three hours of driving are nearly twice as likely to cause a vehicle collision as those who are not under the influence of drugs or alcohol".[64]

In Cannabis and driving: a review of the literature and commentary, the United Kingdom's Department for Transport reviewed data on cannabis and driving, finding although impaired, "subjects under cannabis treatment appear to perceive that they are indeed impaired. Where they can compensate, they do...".[65] In a review of driving simulator studies, researchers note that "even in those who learn to compensate for a drug's impairing effects, substantial impairment in performance can still be observed under conditions of general task performance (i.e. when no contingencies are present to maintain compensated performance)."[66]

A 2012 meta-analysis found that acute cannabis use increased the risk of an automobile crash.[67] An extensive 2013 review of 66 studies regarding crash risk and drug use found that cannabis was associated with minor, but not statistically significant increased odds of injury or fatal accident.[68]

In the largest and most precisely controlled study of its kind carried out by the U.S. Department of Transportation's National Highway Traffic Safety Administration, it was found that other "studies that measure the presence of THC in the drivers' blood or oral fluid, rather than relying on self-report tend to have much lower (or no) elevated crash risk estimates. Likewise better controlled studies have found lower (or no) elevated crash risk estimates".[62] The study found that "after adjusting for age, gender, race and alcohol use, drivers who tested positive for marijuana were no more likely to crash than those who had not used any drugs or alcohol prior to driving".[69]

A 2018 study indicated that the number of fatal crashes involving marijuana after the recreational marijuana legalization or decriminalization increased in Colorado, Washington, and Massachusetts.[70]

Cardiovascular effects

Short-term (one to two hours) effects on the cardiovascular system can include increased heart rate, dilation of blood vessels, and fluctuations in blood pressure.[71][72][73] There are medical reports of occasional heart attacks or myocardial infarction, stroke and other cardiovascular side effects.[74] Marijuana's cardiovascular effects are not associated with serious health problems for most young, healthy users.[74] Researchers reported in the International Journal of Cardiology, "Marijuana use by older people, particularly those with some degree of coronary artery or cerebrovascular disease, poses greater risks due to the resulting increase in catecholamines, cardiac workload, and carboxyhemoglobin levels, and concurrent episodes of profound postural hypotension. Indeed, marijuana may be a much more common cause of myocardial infarction than is generally recognized. In day-to-day practice, a history of marijuana use is often not sought by many practitioners, and even when sought, the patient's response is not always truthful".[75]

A 2013 analysis of 3,886 myocardial infarction survivors over an 18-year period showed "no statistically significant association between marijuana use and mortality".[76]

A 2008 study by the National Institutes of Health Biomedical Research Centre in Baltimore found that heavy, chronic smoking of marijuana (138 joints per week) changed blood proteins associated with heart disease and stroke.[77]

A 2000 study by researchers at Boston's Beth Israel Deaconess Medical Center, Massachusetts General Hospital and Harvard School of Public Health found that a middle age person's risk of heart attack rises nearly fivefold in the first hour after smoking marijuana, "roughly the same risk seen within an hour of sexual activity".[78][79]

Cannabis arteritis is a very rare peripheral vascular disease similar to Buerger's disease. There were about 50 confirmed cases from 1960 to 2008, all of which occurred in Europe.[80]

Combination with other drugs

A confounding factor in cannabis research is the prevalent usage of other recreational drugs, especially alcohol and nicotine.[81] Such complications demonstrate the need for studies on cannabis that have stronger controls, and investigations into alleged symptoms of cannabis use that may also be caused by tobacco. Some critics question whether agencies doing the research make an honest effort to present an accurate, unbiased summary of the evidence, or whether they "cherry-pick" their data to please funding sources which may include the tobacco industry or governments dependent on cigarette tax revenue; others caution that the raw data, and not the final conclusions, are what should be examined.[82]

The Australian National Household Survey of 2001[83] showed that cannabis in Australia is rarely used without other drugs. 95% of cannabis users also drank alcohol; 26% took amphetamines; 19% took ecstasy and only 2.7% reported not having used any other drug with cannabis.[84] While research has been undertaken on the combined effects of alcohol and cannabis on performing certain tasks, little research has been conducted on the reasons why this combination is so popular. Evidence from a controlled experimental study undertaken by Lukas and Orozco[85] suggests that alcohol causes THC to be absorbed more rapidly into the blood plasma of the user. Data from the Australian National Survey of Mental Health and Wellbeing[86] found that three-quarters of recent cannabis users reported using alcohol when cannabis was not available, this suggests that the two are substitutes.[87]

Memory and learning

Studies on cannabis and memory are hindered by small sample sizes, confounding drug use, and other factors.[88] The strongest evidence regarding cannabis and memory focuses on its temporary negative effects on short-term and working memory.[88]

In a 2001 study looking at neuropsychological performance in long-term cannabis users, researchers found "some cognitive deficits appear detectable at least 7 days after heavy cannabis use but appear reversible and related to recent cannabis exposure rather than irreversible and related to cumulative lifetime use".[89] On his studies regarding cannabis use, lead researcher and Harvard professor Harrison Pope said he found marijuana is not dangerous over the long term, but there are short-term effects. From neuropsychological tests, Pope found that chronic cannabis users showed difficulties, with verbal memory in particular, for "at least a week or two" after they stopped smoking. Within 28 days, memory problems vanished and the subjects "were no longer distinguishable from the comparison group".[90] Researchers from the University of California, San Diego School of Medicine failed to show substantial, systemic neurological effects from long-term recreational use of cannabis. Their findings were published in the July 2003 issue of the Journal of the International Neuropsychological Society.[91] The research team, headed by Dr Igor Grant, found that cannabis use did affect perception, but did not cause permanent brain damage. Researchers looked at data from 15 previously published controlled studies involving 704 long-term cannabis users and 484 nonusers. The results showed long-term cannabis use was only marginally harmful on the memory and learning. Other functions such as reaction time, attention, language, reasoning ability, perceptual and motor skills were unaffected. The observed effects on memory and learning, they said, showed long-term cannabis use caused "selective memory defects", but that the impact was "of a very small magnitude".[92] A study at Johns Hopkins University School of Medicine showed that very heavy use of marijuana is associated with decrements in neurocognitive performance even after 28 days of abstinence.[93]

Appetite

The feeling of increased appetite following the use of cannabis has been documented for hundreds of years,[94] and is known colloquially as "the munchies" in the English-speaking world. Clinical studies and survey data have found that cannabis increases food enjoyment and interest in food.[95][96] A 2015 study suggests that cannabis triggers uncharacteristic behaviour in POMC neurons, which are usually associated with decreasing hunger.[97][98]

Endogenous cannabinoids ("endocannabinoids") were discovered in cow's milk and soft cheeses.[99][100] Endocannabinoids are also found in human breast milk.[101][102][103][104][105] It is widely accepted that the neonatal survival of many species "is largely dependent upon their suckling behavior, or appetite for breast milk"[106] and recent research has identified the endogenous cannabinoid system to be the first neural system to display complete control over milk ingestion and neonatal survival.[105] It is possible that "cannabinoid receptors in our body interact with the cannabinoids in milk to stimulate a suckling response in newborns so as to prevent growth failure".[106]

Pathogens and microtoxins

Most microorganisms found in cannabis only affect plants and not humans, but some microorganisms, especially those that proliferate when the herb is not correctly dried and stored, can be harmful to humans. Some users may store marijuana in an airtight bag or jar in a refrigerator to prevent fungal and bacterial growth.[107]

Fungi

Aspergillus fumigatus.

The fungi Aspergillus flavus,[108] Aspergillus fumigatus,[108] Aspergillus niger,[108] Aspergillus parasiticus, Aspergillus tamarii, Aspergillus sulphureus, Aspergillus repens, Mucor hiemalis (not a human pathogen), Penicillium chrysogenum, Penicillium italicum and Rhizopus nigricans have been found in moldy cannabis.[107] Aspergillus mold species can infect the lungs via smoking or handling of infected cannabis and cause opportunistic and sometimes deadly aspergillosis.[109] Some of the microorganisms found create aflatoxins, which are toxic and carcinogenic. Researchers suggest that moldy cannabis should thus be discarded to avoid these serious risks.

Mold is also found in smoke from mold-infected cannabis,[107][108] and the lungs and nasal passages are a major means of contracting fungal infections. Levitz and Diamond (1991) suggested baking marijuana in home ovens at 150 °C [302 °F], for five minutes before smoking. Oven treatment killed conidia of A. fumigatus, A. flavus and A. niger, and did not degrade the active component of marijuana, tetrahydrocannabinol (THC)."[107]

Bacteria

Cannabis contaminated with Salmonella muenchen was positively correlated with dozens of cases of salmonellosis in 1981.[110] "Thermophilic actinomycetes" were also found in cannabis.[108]

Long-term effects

Exposure to marijuana may have biologically based physical, mental, behavioral, and social health consequences and is "associated with diseases of the liver (particularly with co-existing hepatitis C), lungs, heart, eyesight, and vasculature" according to a 2013 literature review by Gordon and colleagues. The association with these diseases has only been reported in cases where people have smoked cannabis. The authors cautioned that "evidence is needed, and further research should be considered, to prove causal associations of marijuana with many physical health conditions".[111]

Cannabis use disorder is defined in the fifth revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) as a condition requiring treatment.[111] Several drugs have been investigated in an attempt to ameliorate the symptoms of stopping cannabis use. Such drugs include bupropion, divalproex, nefazodone, lofexidine, and dronabinol. Of these, dronabinol (a trade name for THC) has proven the most effective.[112] The drugs buspirone and rimonabant have shown some success in helping maintain cannabis abstinence.[113]

There is evidence that long-term use of cannabis increases the risk of psychosis, regardless of confounding factors, and particularly for people who have genetic risk factors.[114] A 2019 meta-analysis found that 34% of people with cannabis-induced psychosis transitioned to schizophrenia. This was found to be comparatively higher than hallucinogens (26%) and amphetamines (22%).[115]

Long-term cannabis users are at risk for developing cannabinoid hyperemesis syndrome (CHS), characterized by recurrent bouts of intense vomiting. The mechanism behind CHS is poorly understood and is contrary to the antiemetic properties of cannabis and cannabinoids. Of those who went to the emergency department (ED) with recurrent vomiting in one institution in the United States from 2005 to 2010, about 6% had the condition.[116][117]

Effects in pregnancy

Cannabis consumption in pregnancy might be associated with restrictions in growth of the fetus, miscarriage, and cognitive deficits in offspring based on animal studies, although there is limited evidence for this in humans at this time.[118] A 2012 systematic review found although it was difficult to draw firm conclusions, there was some evidence that prenatal exposure to cannabis was associated with "deficits in language, attention, areas of cognitive performance, and delinquent behavior in adolescence".[119] A report prepared for the Australian National Council on Drugs concluded cannabis and other cannabinoids are contraindicated in pregnancy as it may interact with the endocannabinoid system.[120]

Effects in pediatrics

Children can become exposed to cannabis, typically through accidental exposure which can lead to very high doses, especially in the case of edibles. Unlike in adults, these levels of exposure can lead to major complications in children.[121] These complications include encephalopathy, hypotension, respiratory depression severe enough to require ventilation, somnolence, coma, and there have been case reports of death.[121][122][123] Pediatric exposure to edibles is of increasing concern because these products are typically sweets (gummies, cookies, etc.), and their prevalence is increasing as cannabis is legalized or decriminalized in many territories.[124]

See also

References

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