Cannabis History

A comprehensive timeline of cannabis — from ancient medicinal use in China and India through colonial hemp farming, racial prohibition, the War on Drugs, and the modern legalization movement reshaping policy worldwide.

FeaturedAncient & Classical

Ancient Cannabis Use: China, India & Egypt

Explore the origins of cannabis use in ancient China, India, and Egypt — from Emperor Shen Nung's pharmacopoeia to sacred Hindu rituals and Egyptian medical papyri.

2700 BC
Time period
4
Key figures
6
Sections

Timeline

2700 BCAncient & Classical

Ancient Cannabis Use: China, India & Egypt

1600s-1800sColonial & Early America

Cannabis in Colonial America: Hemp Farming & the Founding Fathers

1910s-1930sProhibition Era

Mexican Immigration & the Racial Roots of Marijuana Prohibition

1937Prohibition Era

The Marihuana Tax Act of 1937: Anslinger, Reefer Madness & Federal Prohibition

1960sProhibition Era

Cannabis & the 1960s Counterculture: The Hippie Movement & Cultural Revolution

1970Prohibition Era

The Controlled Substances Act of 1970: Nixon & Schedule I Classification

1971-presentProhibition Era

The War on Drugs: Reagan, Mandatory Minimums & Mass Incarceration

1996Reform & Medical

California Proposition 215: The First Medical Cannabis State (1996)

2000-2011Reform & Medical

Medical Cannabis Expansion in the 2000s: State-by-State Growth

2012Modern Era

Colorado Amendment 64: The First Recreational Legalization (2012)

2013Modern Era

The Cole Memorandum: Federal Non-Enforcement Policy

2018Modern Era

Sessions Rescinds the Cole Memo: The 2018 Enforcement Crisis

2018Modern Era

The 2018 Farm Bill: Hemp Legalization & the CBD Explosion

2018Modern Era

Canada's Cannabis Legalization: First G7 Nation (2018)

2018-presentModern Era

Cannabis Social Equity: Racial Justice in Legalization

2019-presentModern Era

The SAFE Banking Act: Cannabis Banking Reform Efforts

2023-presentModern Era

The Rescheduling Debate: Schedule III Proposal & DEA Review

2020-presentModern Era

The State Legalization Wave: NY, NJ, VA, MN & OH (2020s)

1961-presentModern Era

Cannabis & the United Nations: International Treaty History

2025-beyondModern Era

The Future of Cannabis Legalization: Federal Outlook & Global Trends

Colonial & Early America

Hemp farming, early American industry, and the roots of cannabis culture.

Colonial & Early America

Cannabis in Colonial America: Hemp Farming & the Founding Fathers

How hemp shaped colonial America — from mandatory cultivation laws to George Washington and Thomas Jefferson's hemp farms and early American industry.

1600s-1800s
Time period

Prohibition Era

The criminalization of cannabis, the War on Drugs, and mass incarceration.

Prohibition Era

Mexican Immigration & the Racial Roots of Marijuana Prohibition

How anti-Mexican racism fueled America's first marijuana laws — from the Mexican Revolution to state prohibition campaigns and the deliberate use of the word 'marijuana.'

1910s-1930s
Time period
Prohibition Era

The Marihuana Tax Act of 1937: Anslinger, Reefer Madness & Federal Prohibition

How Harry Anslinger and the Reefer Madness campaign led to the Marihuana Tax Act of 1937 — the federal law that effectively banned cannabis in America.

1937
Time period
Prohibition Era

Cannabis & the 1960s Counterculture: The Hippie Movement & Cultural Revolution

How cannabis became a symbol of the 1960s counterculture — from the hippie movement and Timothy Leary to Vietnam War protests and the cultural revolution.

1960s
Time period
Prohibition Era

The Controlled Substances Act of 1970: Nixon & Schedule I Classification

How Nixon's Controlled Substances Act placed cannabis in Schedule I alongside heroin — ignoring his own commission's recommendations and shaping drug policy for 50+ years.

1970
Time period
Prohibition Era

The War on Drugs: Reagan, Mandatory Minimums & Mass Incarceration

The history of the War on Drugs from Nixon's declaration through Reagan's mandatory minimums — mass incarceration, racial disparities, and the devastating impact on cannabis users.

1971-present
Time period

Reform & Medical

The rise of medical cannabis, state-level legalization, and shifting public opinion.

Reform & Medical

California Proposition 215: The First Medical Cannabis State (1996)

How California's Proposition 215 in 1996 became the first state medical marijuana law, launching the medical cannabis movement and defying federal prohibition.

1996
Time period
Reform & Medical

Medical Cannabis Expansion in the 2000s: State-by-State Growth

How medical marijuana expanded across America in the 2000s — from a handful of states to a nationwide movement reshaping cannabis policy and public opinion.

2000-2011
Time period

Modern Era

Recreational legalization, federal reform efforts, and the future of cannabis policy.

Modern Era

Colorado Amendment 64: The First Recreational Legalization (2012)

How Colorado's Amendment 64 made history in 2012 as the first jurisdiction to legalize recreational marijuana — launching the adult-use cannabis era and creating a $2B+ market.

2012
Time period
Modern Era

The Cole Memorandum: Federal Non-Enforcement Policy

How the Cole Memorandum established federal non-enforcement of state marijuana laws, enabling the legal cannabis industry to grow — and what happened when it was rescinded.

2013
Time period
Modern Era

Sessions Rescinds the Cole Memo: The 2018 Enforcement Crisis

How Attorney General Jeff Sessions' rescission of the Cole Memo in January 2018 rocked the cannabis industry and ultimately revealed the political impossibility of a federal crackdown.

2018
Time period
Modern Era

The 2018 Farm Bill: Hemp Legalization & the CBD Explosion

How the 2018 Farm Bill legalized hemp, launched a multi-billion dollar CBD industry, and separated hemp from marijuana under federal law for the first time since 1937.

2018
Time period
Modern Era

Canada's Cannabis Legalization: First G7 Nation (2018)

How Canada became the first G7 nation to legalize recreational cannabis in 2018 under Prime Minister Justin Trudeau, creating a federal regulatory model and $4B+ market.

2018
Time period
Modern Era

Cannabis Social Equity: Racial Justice in Legalization

How social equity programs attempt to address the racial injustice of cannabis prohibition — from expungement to licensing priority for communities most harmed by the War on Drugs.

2018-present
Time period
Modern Era

The SAFE Banking Act: Cannabis Banking Reform Efforts

The history of the SAFE Banking Act — the most-passed cannabis bill in Congressional history that has repeatedly cleared the House but stalled in the Senate.

2019-present
Time period
Modern Era

The Rescheduling Debate: Schedule III Proposal & DEA Review

The history of cannabis rescheduling from Schedule I to Schedule III — HHS recommendation, DEA review, and the potential impact on the cannabis industry and federal policy.

2023-present
Time period
Modern Era

The State Legalization Wave: NY, NJ, VA, MN & OH (2020s)

How a wave of state legalizations in the 2020s expanded recreational cannabis to major East Coast and Midwest markets — from New York and New Jersey to Virginia, Minnesota, and Ohio.

2020-present
Time period
Modern Era

Cannabis & the United Nations: International Treaty History

The history of cannabis in international drug treaties — from the 1961 Single Convention to the UN's 2020 vote reclassifying cannabis and the evolving global policy landscape.

1961-present
Time period
Modern Era

The Future of Cannabis Legalization: Federal Outlook & Global Trends

Analysis of the future of cannabis legalization — federal reform prospects, rescheduling implications, global trends, and the path toward ending prohibition.

2025-beyond
Time period

Explore More

Legalization Tracker

Global cannabis legalization status across 40+ countries with investment implications.

Industry Intelligence

Data-driven analysis of the cannabis industry covering market trends, regulation, and technology.

Cannabis Stocks

Track all publicly traded cannabis companies with live market data, financials, and analysis.

Frequently Asked Questions

How far back does cannabis history go?
Cannabis history stretches back nearly 5,000 years. The earliest documented use dates to approximately 2700 BC in China, where Emperor Shen Nung cataloged it as a medicinal herb. Archaeological evidence of hemp fiber use extends even further, to roughly 4000 BC.
When was cannabis first made illegal in the United States?
The first U.S. cannabis ban was in El Paso, Texas in 1914, driven by anti-Mexican sentiment. State-level prohibitions spread rapidly, with 29 states banning marijuana by 1931. Federal prohibition began with the Marihuana Tax Act of 1937 and was reinforced by the Controlled Substances Act of 1970.
Which was the first state to legalize recreational marijuana?
Colorado and Washington both legalized recreational marijuana on November 6, 2012. Colorado's Amendment 64 and Washington's Initiative 502 passed on the same election day. Colorado began the first legal recreational sales on January 1, 2014.
How many states have legalized cannabis as of 2025?
As of 2025, 24 states plus Washington D.C. have legalized adult-use recreational cannabis, covering approximately 55% of the U.S. population. An additional 14 states have medical-only programs. The number continues to grow through ballot measures and legislative action.
What role did racism play in cannabis prohibition?
Racism was foundational to cannabis prohibition. Anti-Mexican sentiment drove the first marijuana laws in the 1910s. The word 'marijuana' was deliberately used to associate the plant with Mexican immigrants. Harry Anslinger's federal prohibition campaign used explicitly racist propaganda targeting Black and Mexican communities. Enforcement has disproportionately impacted communities of color ever since.