Cannabis
Cannabis is a genus of flowering plant that has been used for thousands of years for medicinal, spiritual, and recreational purposes.1 Its primary psychoactive constituent is delta-9-tetrahydrocannabinol (THC), though dozens of additional cannabinoids and terpenes contribute to its overall effects. It ranks among the most widely consumed recreational substances globally, behind only alcohol, caffeine, and tobacco. Its two principal species, sativa and indica, are recognized for producing distinct effect profiles.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Doses are expressed as milligrams of THC content. Oral use takes longer to take effect than smoking but lasts longer; effects from large oral doses can persist for an extended period.
Duration
Subjective Effects
When used in combination with psychedelics, cannabis is capable of intensifying and extending the duration of both the visual and cognitive effects with extreme efficiency. This should be used with caution if one is not experienced with psychedelics. When used in combination with dissociatives, the geometry, euphoria, dissociation and hallucinatory effects are often greatly enhanced. When used in combination with alcohol, cannabis often creates feelings of extreme nausea, dizziness and changes in gravity. It is recommended that people smoke before drinking and not the other way around unless they are extremely cautious.
Physical
Cognitive
Visual
Enhancements
Geometry
Cannabis is capable of inconsistently inducing mild psychedelic geometry at extremely high doses within many users. Within many users who also regularly use psychedelics, however, it is capable of inducing these consistently in a visual style which seems to be an averaged out depiction of all the psychedelics one has used within the past. These rarely extend beyond level 4 and are considered to be mild, fine, small and zoomed out (but often well-defined).
Auditory
Multisensory
Pharmacology
Pharmacodynamics
The principal psychoactive constituent of cannabis is Δ⁹-tetrahydrocannabinol (THC), one of at least 84 cannabinoids found in the plant alongside other notable compounds such as cannabidiol (CBD), cannabinol (CBN), tetrahydrocannabivarin (THCV), and cannabigerol (CBG). THC acts as an agonist at CB1 cannabinoid receptors,2 inhibiting the adenylate cyclase secondary messenger system in a dose-dependent manner and indirectly increasing dopamine release. THC also potentiates glycine receptor activity, while CBD acts as an allosteric modulator of the mu and delta opioid receptors. Activation of CB1 and CB2 receptors upregulates 5-HT2A receptor activity through the ERK1/ERK2 signaling pathway, though the exact biochemical mechanism underlying this effect is unknown.
Pharmacokinetics
THC undergoes hepatic metabolism, producing the psychoactive metabolite 11-hydroxy-THC.2 CYP2C9 genotype significantly influences THC clearance: individuals with the CYP2C9 *3/*3 genotype exhibit approximately 3-fold higher blood THC concentrations compared to those with *1/*1, while heterozygous *1/*3 carriers show roughly 2-fold higher levels.3
Caution
Use cautionThese combinations are not usually physically harmful, but may produce undesirable effects, such as physical discomfort or overstimulation. Extreme use may cause physical health issues. Synergistic effects may be unpredictable. Care should be taken when choosing to use this combination.
Tolerance
Tolerance timelines are rules of thumb, not exact schedules, and vary widely between individuals and use patterns.
All cannabinoids (THC, CBD, synthetic cannabinoids)
Harm Potential
Addiction & Dependence
Psychological
LowLow to moderate abuse potential with risk of psychological dependence in some individuals with chronic use.4 Studies estimate 5-10% of users may become daily users at some point, though most discontinue by age 30. Dependence rates are lower than both alcohol and nicotine.4
Physical
LowMild physical dependence can develop with regular daily use.5 Withdrawal symptoms include irritability, insomnia, sweating, loss of appetite, and restlessness,5 typically lasting 1-2 weeks but occasionally up to 6 weeks in heavy users.5 Symptoms are never life-threatening.
Toxicity
Chronic smoking may cause respiratory issues including coughing, bronchitis, increased throat and lung infections, and reduced lung capacity;6 however, well-designed epidemiological studies have not found increased risk of lung cancer or COPD from cannabis alone,6 with pulmonary risks far lower than tobacco smoking.6
Acute cardiovascular effects including increased heart rate and blood pressure changes occur during intoxication;7 a large study of 65,000 individuals found no increased mortality in users under 50, though those with pre-existing heart conditions may face elevated risk.
Regular use may cause cognitive effects including short-term memory impairment, reduced motivation, and difficulty learning;8 these effects are typically reversible with abstinence,8 and well-controlled studies have not found evidence of permanent IQ loss or brain structure changes from cannabis use.89
Psychosis Risk
Acute psychotic symptoms including paranoia, delusions, and anxiety can occur, particularly at high doses.10 Prolonged use may increase psychosis risk in predisposed individuals with family history of schizophrenia or other psychotic disorders.1011 A 2011 FDA report found no clear causal linkage between cannabis use and psychotic disorders in otherwise healthy people, though associations have been documented between adolescent use and later psychotic diagnoses.11
History & Culture
Origins and Early History
Cannabis represents one of humanity's oldest cultivated plants, first domesticated approximately 12,000 years ago in East Asia during the early Neolithic period.12 Genetic and archaeological evidence suggests human use may extend even further back, possibly to the…
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Legality
International
1961 Single Convention: cannabis and cannabis resin remain in Schedule I.
1971 Convention on Psychotropic Substances: THC-related substances are separately scheduled; this country-level cannabis record makes no additional normalized claim.
1988 Convention: cannabis is not listed in precursor Tables I or II.
By Country
References
Source Pages
Drug Users Bible by Dominic Milton Trott
DrugBank: Δ9-Tetrahydrocannabinol
Erowid
Erowid Cannabis Vault: Dosage
Erowid Cannabis Vault: Effects
Erowid: The LESS Method - Measured Approach to Oral Cannabis
NERVEWING
PsychonautWiki
PsychonautWiki: Cannabis/Summary
The Drug Classroom
TripSit Factsheets
TripSit Wiki
TripSit Wiki: Drug Combinations
Wikipedia
Wikipedia: Cannabis sativa
Wikipedia: Tetrahydrocannabinol
Citations
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Further Reading
HempGeneration: THCA Decarboxylation Temperatures
NCBI PMC: Cannabis & Alcohol Impairment Study
NCBI PMC: Cannabis Pharmacokinetics Review
NCBI PMC: Drug Interactions with Cannabinoids
NCBI PMC: Pharmacokinetics of THC & 11-OH-THC
NCBI PMC: Tolerance to High-Dose Oral THC
NIDA: Cannabis Research & Facts
The Psychedelic Society: Cannabis Harm Reduction
WHO ECDD: Cannabinoid Critical Review (2018)
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