Cannabis has been part of human life for an extraordinarily long time. Used as fiber, medicine, ritual sacrament, and pleasure across every inhabited continent. The story we tell here is necessarily compressed, but every entry below sits on solid historical or scientific ground.
Dates marked βc.β (circa) reflect approximate or traditional attribution. A handful of the earliest claims are well-grounded but contested in detail; we've flagged hedging where it matters.
Pre-500 CE β first medical, ritual, and material uses
Carbonized hemp rope and impressions on pottery from sites in modern-day Taiwan and mainland China are the oldest material evidence of human use of the cannabis plant β primarily for fiber.
Chinese tradition credits Emperor Shen Nung with cataloging cannabis (ιΊ», 'ma') as one of fifty fundamental herbs. The Shennong Bencao Jing was compiled later (c. 1st century CE) but preserves the tradition of long-standing medical use.
One of the oldest preserved medical texts. References to 'shemshemet' have been interpreted by Egyptologists as cannabis used for inflammation and as a topical remedy.
The Atharva Veda names cannabis (bhang) among five sacred plants. Its association with Lord Shiva and use in religious festivals like Holi traces back to this period.
Cuneiform tablets from the library of Ashurbanipal reference 'qunnabu' as a remedy for grief, depression, and inflammation β administered, in some texts, by inhalation of smoke.
The Greek historian describes Scythians throwing cannabis seeds on heated stones inside enclosed tents, inhaling the vapor as a funeral rite β one of the earliest unambiguous descriptions of psychoactive use.
The physician Hua Tuo is recorded using 'mafeisan' β a wine-and-herb compound widely thought to contain cannabis β to render patients insensible during surgery. One of the earliest references to surgical anesthesia.
The Greek physician's 'De Materia Medica' β the most influential pharmacology text of the next 1,500 years β describes cannabis seeds and juice as remedies for earache, inflammation, and pain.
500β1800 CE β global diffusion along trade routes
Persian and Arab physicians including al-Razi and Avicenna documented cannabis-based preparations for nausea, epilepsy, headaches, and pain. Hashish use spread alongside the Islamic golden age.
Some Sunni jurists (notably Ibn Taymiyyah) classify hashish as forbidden, sparking the first sustained prohibition debates in cannabis history. Use continues regardless across much of the region.
Portuguese ships and enslaved Africans bring cannabis to Brazil. Within a century it spreads across the New World, accompanying both colonial agriculture and African diaspora traditions.
English colonists cultivate hemp at Jamestown for rope, canvas, and paper. Virginia would later mandate that farmers grow it.
French soldiers in Egypt encounter widespread hashish use; Napoleon issues one of the earliest modern prohibitions of cannabis (largely ignored). Troops bring the substance home with them.
1800s β cannabis enters European and American pharmacy
Working in Calcutta, Irish surgeon William Brooke O'Shaughnessy publishes a landmark paper on cannabis tinctures, demonstrating their use for tetanus, rheumatism, rabies, and convulsions. Western pharmacy takes notice.
Parisian literati β including Baudelaire, Gautier, Dumas, and Hugo β meet at the HΓ΄tel Pimodan to experiment with hashish in 'dawamesk' form. The club shapes a romanticized Western image of cannabis that lingers for a century.
Listed as a recognized treatment for more than 100 conditions, cannabis tinctures and extracts are sold widely by major American pharmaceutical companies for the next 80 years.
Sir J. Russell Reynolds, the queen's personal physician, publishes in The Lancet calling cannabis 'one of the most valuable medicines we possess' for pain and menstrual cramps. He reportedly prescribed it to the queen herself.
1900β1990 β criminalization and the science that survived it
First US federal law requiring labeling of cannabis (and other narcotics) in patent medicines. A foundation for the regulatory state, not yet a prohibition.
Quietly added to a list of restricted substances. Other states follow over the next two decades, often paired with racially-charged rhetoric tying cannabis to Mexican immigrants and Black communities.
An amendment in Geneva places cannabis under international narcotic control for the first time, setting the legal stage for the global criminalization that would follow.
The notorious propaganda film fuels public fear, pairing exaggerated claims about cannabis with racialized panic. It becomes a cultural artifact of the prohibition movement and, decades later, an unintentional comedy.
Effectively criminalizes cannabis in the US via prohibitive taxation. Championed by Federal Bureau of Narcotics commissioner Harry Anslinger over the objections of the American Medical Association.
After 92 years as an officially recognized medicine, cannabis is struck from the national pharmacopeia β eliminating it from mainstream American medical practice for the rest of the century.
Commissioned by NYC Mayor Fiorello La Guardia, the New York Academy of Medicine concludes cannabis is not a gateway drug, not addictive in the medical sense, and does not cause violence or insanity. Federal officials denounce the report.
Places cannabis on Schedule IV β the strictest category β and obligates signatory countries to outlaw it. The framework that shaped global prohibition for the next 60 years.
Chemist Raphael Mechoulam and colleagues at the Weizmann Institute identify Ξ-9-tetrahydrocannabinol as the primary psychoactive compound β opening the scientific study of cannabinoids.
Cannabis placed on Schedule I: 'no currently accepted medical use' and 'high potential for abuse'. Intended as a placeholder pending the Shafer Commission's review β and never moved.
President Nixon's own bipartisan commission recommends decriminalization of personal use. Nixon rejects it outright. The report remains a foundational document in reform advocacy.
First US state to remove criminal penalties for small-scale personal possession, reducing them to a civil fine. A dozen states follow over the next decade.
The Netherlands begins formally tolerating small-scale cannabis sales in licensed coffeeshops under a 'gedoogbeleid' policy of non-enforcement. The first sustained, regulated alternative to prohibition.
The Lynn Pierson Therapeutic Research Act enables cannabis access for cancer patients facing chemotherapy. The first modern state-level medical cannabis program.
The FDA approves dronabinol β a synthetic THC capsule β for chemotherapy-induced nausea and, later, HIV-related anorexia. A tacit federal acknowledgment that THC has medical value.
After a multi-year petition, DEA administrative law judge Francis Young rules that cannabis 'is one of the safest therapeutically active substances known' and should be rescheduled. The DEA administrator overrides him.
Pharmacologist Allyn Howlett and graduate student William Devane characterize a receptor in the brain that responds to THC. The endocannabinoid system enters the scientific literature.
1990βtoday β medical revival, legalization, and the unfinished story
Mechoulam's lab identifies the first endogenous cannabinoid β anandamide, named for the Sanskrit word for 'bliss'. The body, it turns out, makes its own cannabis-like signaling molecules.
Researchers identify a second cannabinoid receptor in immune cells. CB1 + CB2 + endocannabinoids = the endocannabinoid system, now understood as a fundamental regulatory network across the body.
California voters approve the first modern state medical cannabis program. By the end of the decade, several more states follow, kicking off the slow unwinding of US prohibition.
First country to establish a national medical cannabis program. Becomes a long-running model for federal medical access β and a sign of where the global tide was heading.
US Deputy Attorney General David Ogden directs federal prosecutors not to prioritize medical cannabis cases in compliant states. The federal-state truce that lets the medical industry scale.
On the same November ballot, Colorado and Washington become the first US states β and among the first jurisdictions anywhere β to legalize adult recreational cannabis. Markets open in 2014.
Under President JosΓ© Mujica, Uruguay becomes the first country to fully legalize cannabis nationwide, regulating cultivation, sale, and possession through a state-overseen pharmacy + co-op model.
On October 17, the Cannabis Act takes effect, making Canada the second country and the first G7 nation to fully legalize adult recreational use.
Hemp + non-intoxicating CBD removed from the Controlled Substances Act, kicking off a massive national CBD market and creating regulatory ambiguity that's still being sorted out today.
FDA approves Epidiolex β a purified CBD pharmaceutical β for two severe pediatric seizure disorders. The first plant-derived cannabis medicine approved by the FDA.
The court strikes down absolute prohibition of adult cannabis use as a violation of personal autonomy. The legislature has been working out the full regulatory framework since.
President Biden issues a mass pardon for federal cannabis possession convictions and directs HHS to review cannabis's Schedule I classification β the first serious federal scheduling review since 1970.
The first Asian country to broadly decriminalize cannabis use. A subsequent walk-back (2024) narrows the framework toward medical-only, but a meaningful shift remains.
On April 1, possession and home-grow become legal for adults. Non-profit cultivation clubs scale through the year. Germany becomes the largest national legal market in Europe.
After HHS's 2023 recommendation, the DEA opens formal rulemaking to move cannabis from Schedule I to III. The public comment period draws record-breaking participation. Process ongoing.