Marijuana

Marijuana
Cannabis Pictures · CC BY 2.0 · source
Name	Marijuana
Other names	Cannabis, weed, pot
Drug class	Psychoactive substance
Legal status	Varies by jurisdiction

Marijuana is a psychoactive substance derived from the flowering parts of plants in the genus Cannabis, used across cultures for medicinal, ritual, and recreational purposes. Its use and regulation intersect with public health, law, and economy, producing diverse policies and debates in countries such as the United States, Canada, Netherlands, Portugal, and Uruguay. Scientific study of its botany, chemistry, therapeutic potential, and social impact has involved institutions like the World Health Organization, National Institutes of Health, Centers for Disease Control and Prevention, and universities including Johns Hopkins University, University of California, Los Angeles, and University of British Columbia.

Etymology and terminology

The English term derives from Spanish and possibly Romani sources and entered common usage in the early 20th century alongside terms like Cannabis, hemp, and hashish; historical records reference similar substances in texts associated with Shakespeare, Marco Polo, and travelers to the Indian subcontinent. Modern regulatory and scientific contexts prefer formal names such as Cannabis sativa, Cannabis indica, and Cannabis ruderalis, terms established in botanical literature connected to figures like Carl Linnaeus and Jean-Baptiste Lamarck. Slang and colloquial vocabulary has been shaped by cultural movements linked to Beat Generation, Hippie movement, Reggae, and artists associated with Bob Marley.

Botany and cultivation

Cannabis species are flowering plants in the family Cannabaceae, with morphological variation described in taxonomic treatments by botanists associated with institutions like the Royal Botanic Gardens, Kew and the New York Botanical Garden. Cultivation techniques—indoor, greenhouse, and outdoor—are influenced by practices documented in agricultural research from Iowa State University, Cornell University, and horticultural studies linked to University of California, Davis. Propagation uses seeds, clones, and tissue culture methods studied in plant physiology literature tied to researchers at Stanford University and Massachusetts Institute of Technology. Issues such as photoperiod control, nutrient management, pest interactions with species recorded by the United States Department of Agriculture, and breeding programs at centers like Rothamsted Research and private companies have driven development of high-THC and high-CBD cultivars.

Chemical composition and pharmacology

Cannabis produces a complex phytochemical profile including cannabinoids, terpenes, and flavonoids characterized in analytical chemistry studies at Massachusetts General Hospital, Scripps Research, and the Karolinska Institute. Principal cannabinoids include delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD), which interact with the endocannabinoid system mediated by receptors such as CB1 and CB2 identified in research from Imperial College London and Harvard Medical School. Pharmacokinetics and pharmacodynamics have been explored in clinical trials registered at European Medicines Agency and U.S. Food and Drug Administration-regulated centers, with routes of administration—smoking, vaporization, oral, sublingual—evaluated in studies at Mayo Clinic and Cleveland Clinic. Analytical methods like gas chromatography–mass spectrometry and high-performance liquid chromatography are standardized by laboratories at National Institute of Standards and Technology.

Medical and therapeutic uses

Clinical investigation of cannabinoids has produced approved medications such as dronabinol and nabiximols, with regulatory approval processes involving agencies like the European Medicines Agency and U.S. Food and Drug Administration. Research institutions including McGill University, King's College London, and University of Sydney have conducted randomized controlled trials examining efficacy for conditions such as chemotherapy-induced nausea (studied in trials coordinated with National Cancer Institute), chronic pain (investigated at Oxford University), multiple sclerosis spasticity (evaluated in multicenter studies linked to Swissmedic), and pediatric epilepsy syndromes like those leading to drug approvals after work at Children's Hospital of Philadelphia. Professional bodies such as the American Medical Association and Royal College of Physicians have issued policy statements guiding clinical use, while systematic reviews by groups like the Cochrane Collaboration summarize evidence quality.

Recreational use and social impact

Recreational consumption has cultural histories tied to regions including Jamaica, Mexico, and parts of South Asia and has been represented in arts associated with Jazz, Reggae, Beat Generation, and film industries such as Hollywood. Social movements advocating legalization and reform have involved organizations like the Drug Policy Alliance, NORML, and political actors in legislatures of the Colorado General Assembly and California State Legislature. Economic impacts are analyzed by think tanks like the Brookings Institution, RAND Corporation, and business schools at University of Pennsylvania and London School of Economics assessing markets, taxation, and illicit market displacement. Criminal justice outcomes intersect with courts such as the Supreme Court of the United States and national law enforcement agencies including the Federal Bureau of Investigation.

Legal status and regulation

Regulatory regimes vary: countries including Canada and Uruguay established national frameworks legalizing adult use, while many European Union member states maintain mixed approaches with medical authorization pathways influenced by European Court of Justice decisions. In the United States, federal scheduling under laws like the Controlled Substances Act contrasts with state-level statutes passed by voters or legislatures in jurisdictions such as California, Colorado, Washington (state), and Massachusetts. International controls are shaped by treaties and bodies including the Single Convention on Narcotic Drugs, the United Nations Office on Drugs and Crime, and proceedings at the International Narcotics Control Board. Regulatory areas include licensing, quality control by agencies like Health Canada, age restrictions, advertising rules, and diversion prevention measures enforced by customs services and public health departments.

Health effects and public policy debates

Epidemiological and clinical research from institutions such as Johns Hopkins Bloomberg School of Public Health, Columbia University, and Karolinska Institutet examines short-term and long-term effects on cognition, mental health, respiratory function, and dependence; debates reference studies on adolescent development from University College London and neuroimaging work at Max Planck Institute for Human Cognitive and Brain Sciences. Public health agencies including the World Health Organization and Centers for Disease Control and Prevention issue guidance informing policy discussions on harm reduction, impaired driving addressed in protocols from National Highway Traffic Safety Administration, and workplace safety regulated by entities like Occupational Safety and Health Administration. Advocacy and opposition span groups such as American Civil Liberties Union, Mothers Against Drunk Driving, and political parties in parliaments like the House of Commons of the United Kingdom, fueling ongoing legislative and judicial processes.

Category:Cannabis