The History of the Cannabis Movement: From Ancient Medicine to Modern Legalization

Cannabis legalization did not begin with dispensaries, ballot initiatives or politicians suddenly deciding that prohibition had failed. It grew from thousands of years of human interaction with the cannabis plant—and more than a century of organized resistance to laws rooted in misinformation, racial prejudice and punishment.

For most of recorded history, cannabis was treated as a crop, medicine, source of food, religious sacrament or intoxicant. The idea that possessing the plant should result in arrest, imprisonment or lifelong consequences is comparatively recent.

Understanding the history of the cannabis movement therefore requires more than listing the states that legalized marijuana. It means examining how cannabis moved from an accepted agricultural and medicinal resource to a target of prohibition—and how patients, attorneys, scientists, journalists, civil-rights advocates and organizations such as NORML fought to reverse that transformation.

Cannabis Before Prohibition: An Ancient Relationship

Archaeological and genetic evidence indicates that cannabis originated in Asia and has been used by human communities for thousands of years. Researchers have uncovered cannabis seeds, fibers, cordage and impressions in ancient pottery, although assigning an exact date to the plant’s first cultivation remains difficult.

Claims that hemp was definitively used in Taiwan as early as 8000 BCE appear frequently in cannabis histories. There is evidence of ancient cord-marked pottery and early fiber technologies in East Asia, but researchers caution that identifying every surviving impression as cannabis can be uncertain. What the archaeological record does establish is that cannabis became an important source of fiber, seed and oil in ancient Asia.

Cannabis also became part of traditional medicine. Its medicinal history is often traced to the legendary Chinese emperor Shennong, traditionally placed around 2700 BCE. However, Shennong is a mythological or semi-mythological figure, and he did not leave behind a surviving book written in that period.

The text attributed to him, the Shennong Bencaojing or Classic of the Materia Medica, was compiled centuries later—probably during the first or second century CE—from much older oral and medical traditions. It discussed preparations involving cannabis for pain and other conditions. That distinction matters: cannabis has an ancient medical history, but the familiar claim that an emperor personally wrote about it in 2700 BCE should not be treated as a verified event.

Over time, cannabis appeared in the medical and cultural traditions of India, the Middle East, Africa and Europe. Different communities selected and cultivated the plant for fiber, seeds, resin production, medicine, ceremony and intoxication. The modern legal division between “hemp” and “marijuana” did not exist in the form we recognize today.

Hemp Becomes a Strategic Crop

European governments valued hemp because its strong fiber could be turned into rope, sails and cloth. England passed cultivation requirements during the Tudor period as it attempted to secure materials for its growing navy.

King Henry VIII approved a hemp-production requirement in 1533. Queen Elizabeth I continued or renewed policies encouraging hemp cultivation during her reign, including a 1563 measure associated with penalties for certain landowners who failed to grow it.

Spanish colonists introduced hemp cultivation to Chile in approximately 1545, helping bring the crop into the Western Hemisphere.

Hemp was also promoted in England’s North American colonies, although some popular versions of this history have become exaggerated. A Virginia law adopted in 1619 required landholders to plant 100 “silk flax” plants and experiment with English flax and hemp. The surviving text does not support the popular claim that King James personally ordered every Jamestown colonist to grow exactly 100 cannabis plants.

Colonial governments nevertheless encouraged hemp production, and prominent Americans—including George Washington—grew industrial hemp for fiber. Hemp was useful, but claims that it was America’s single largest crop or the world’s most important industry continuously from 1000 BCE to the 1800s are too sweeping to verify.

Hemp was also strategically important during the Napoleonic era because naval powers needed enormous quantities of cordage and sailcloth. Russian hemp was particularly valuable. However, it is inaccurate to say that the United States entered the War of 1812 on Napoleon’s side or that Congress declared war primarily because Britain interrupted American hemp supplies.

The United States declared war on Great Britain on June 18, 1812, amid disputes over maritime trade restrictions, the British impressment of American sailors, attacks on American shipping and tensions involving British support for Indigenous resistance. Hemp formed part of the larger trade economy, but it was not the singular cause of the war.

Cannabis Enters Western Medicine

Irish physician William Brooke O’Shaughnessy helped introduce Indian cannabis preparations to modern Western medicine after conducting research in India. His influential paper on cannabis was published in 1839, and he promoted its medical applications in Britain during the early 1840s.

Cannabis preparations subsequently became available through physicians and pharmacies in the United States. Cannabis entered the United States Pharmacopeia in 1850—not 1842—and remained in official medical references for decades.

Doctors used cannabis preparations for conditions including pain, muscle spasms and sleep problems. But nineteenth-century cannabis medicines were difficult to standardize. Potency varied, oral preparations could produce unpredictable effects and newer pharmaceutical drugs gradually displaced many plant-based medicines.

Cannabis was removed from the United States Pharmacopeia in 1942, several years after the federal government erected major legal barriers to its production and use.

The First Federal Cannabis Regulations

President Theodore Roosevelt signed the Pure Food and Drugs Act on June 30, 1906. The law did not prohibit cannabis. Instead, it targeted adulterated and misbranded products moving through interstate commerce.

Certain potentially dangerous or intoxicating ingredients—including cannabis, alcohol, opium, morphine, cocaine, heroin, chloral hydrate and acetanilide—had to be disclosed when present in covered medicines.

This was consumer-labeling regulation, not marijuana prohibition. During the following decades, however, states began restricting cannabis through poison laws and other statutes.

Racism, Propaganda and the Road to Federal Prohibition

The campaign against cannabis cannot be separated from the politics of race and immigration.

During the early twentieth century, public officials and newspapers increasingly associated “marijuana” with Mexican immigrants, Black musicians and other marginalized communities. Sensational stories portrayed cannabis as a cause of insanity, sexual violence and violent crime without reliable scientific evidence.

Harry J. Anslinger, appointed commissioner of the newly created Federal Bureau of Narcotics in 1930, became one of the most influential promoters of federal marijuana prohibition. His arguments frequently relied on inflammatory anecdotes and racialized claims.

Newspaper publisher William Randolph Hearst’s publications also carried sensational anti-marijuana stories. However, the popular theory that Hearst, Treasury Secretary Andrew Mellon and DuPont secretly coordinated cannabis prohibition to eliminate hemp as a competitor to timber, paper or synthetic materials remains unproven.

There were real political relationships. Anslinger was appointed under Mellon’s Treasury Department, and the Hearst press participated in the era’s sensational journalism. But surviving evidence does not establish the tidy three-company conspiracy often repeated online.

The documented case against prohibition is powerful enough without relying on an unverified industrial conspiracy: federal officials used racism, selective anecdotes, media sensationalism and exaggerated claims about violence to build support for criminalization.

The Marihuana Tax Act of 1937

President Franklin D. Roosevelt signed the Marihuana Tax Act on August 2, 1937. It took effect on October 1, 1937.

The law did not simply announce a conventional federal ban. Instead, it imposed taxes, registration requirements and extensive recordkeeping rules on cannabis transactions. In practice, those requirements made lawful possession and distribution extremely difficult and created the foundation for federal cannabis prohibition.

The American Medical Association objected to the legislation during congressional consideration, warning that the medical profession had not been adequately consulted and challenging the use of the unfamiliar term “marihuana” in place of cannabis.

The law also affected industrial hemp because federal policy generally treated the plant’s agricultural and drug varieties together. The federal government temporarily encouraged hemp production during World War II through the “Hemp for Victory” campaign, but commercial cultivation declined again after the war.

In 1969, the U.S. Supreme Court ruled in Leary v. United States that important provisions of the tax law violated the Fifth Amendment protection against self-incrimination. Congress repealed the Marihuana Tax Act the following year—but replaced it with a broader system of federal drug prohibition.

The Boggs Act and Narcotic Control Act

President Harry Truman signed the Boggs Act on November 2, 1951. The measure established mandatory federal penalties for drug offenses. A first cannabis-possession conviction could bring a sentence of two to ten years and a fine of up to $20,000.

The law is sometimes dated to 1952 because major enforcement actions followed that year, but its correct enactment date is 1951.

Congress then passed the Narcotic Control Act of 1956, which further increased federal drug penalties and reduced judicial discretion. Together, these laws helped turn cannabis enforcement into an increasingly punitive system.

These penalties did not eliminate cannabis consumption. They did, however, give the government more power to incarcerate people and impose lasting consequences for conduct that a growing number of Americans no longer believed should be criminal.

The Birth of the Modern Marijuana-Legalization Movement

Organized cannabis reform became increasingly visible during the 1960s.

The group LEMAR—short for Legalize Marijuana—emerged in 1964 through the work of poet and activist Allen Ginsberg in San Francisco. A New York chapter associated with Ginsberg, Ed Sanders, Randy Wicker and others is generally dated to 1965, rather than 1964.

These activists organized demonstrations, challenged media stereotypes and argued publicly that marijuana prohibition caused more harm than marijuana itself. Their work connected cannabis reform with the era’s broader struggles for free expression, civil rights, gay rights and opposition to government overreach.

In 1969, activists Blair Newman and Michael Aldrich formed Amorphia in California. The organization raised money by selling rolling papers and other merchandise, then used those proceeds to support marijuana reform.

Amorphia later became deeply involved in the California Marijuana Initiative of 1972.

NORML Gives Cannabis Consumers a Voice

Attorney Keith Stroup founded the National Organization for the Reform of Marijuana Laws in 1970.

NORML brought cannabis reform into legislatures, courtrooms, universities and national media. Its mission was not to promote irresponsible consumption. It was to represent Americans who believed responsible cannabis consumers should not be treated as criminals.

The Playboy Foundation, supported by Hugh Hefner, provided NORML’s initial funding in early 1971 and remained an important supporter during the 1970s. It is therefore more accurate to say that NORML was founded in 1970 and received that crucial early funding the following year.

For more than five decades, NORML has challenged prohibition, tracked legislation, supported scientific research, defended patients and consumers, and helped turn a once-marginalized position into a mainstream political movement.

Suncoast NORML proudly carries that legacy forward in Florida. Our name, mission and identity come from the national organization that built a durable political voice for cannabis consumers when doing so was neither popular nor easy.

California’s First Statewide Legalization Vote

On November 7, 1972, California voters considered Proposition 19, also known as the California Marijuana Initiative.

The proposal would have removed state penalties for personal possession, consumption, cultivation and transportation by adults. It did not propose a modern commercial market like those operating today.

Proposition 19 received approximately 33.5% of the statewide vote. It lost decisively, but its support demonstrated that millions of voters were already willing to reconsider prohibition. The measure won approximately 71% of the vote in Berkeley and a narrow majority in San Francisco.

It was the first statewide ballot initiative in American history seeking to legalize personal marijuana activity. The campaign did not immediately “decriminalize Berkeley,” but it strengthened local pressure to make marijuana enforcement a lower priority.

The Shafer Commission Rejects the Logic of Criminalization

The Controlled Substances Act created the National Commission on Marihuana and Drug Abuse, commonly known as the Shafer Commission.

On March 22, 1972, the commission released Marihuana: A Signal of Misunderstanding. It recommended that personal possession and private use no longer be criminal offenses.

President Richard Nixon rejected the recommendation.

Nevertheless, the commission’s findings helped reform advocates challenge claims that severe criminal penalties were necessary. Oregon became the first state to decriminalize possession of small amounts of cannabis in 1973. Ten additional states followed during the 1970s.

The Controlled Substances Act of 1970

President Nixon signed the Controlled Substances Act on October 27, 1970.

The law created five federal drug schedules and initially placed marijuana in Schedule I. That classification represented the federal government’s conclusion that marijuana had a high potential for abuse, no currently accepted medical use in the United States and no accepted safety for use under medical supervision.

That classification remained fundamentally at odds with state medical-cannabis laws, patient experiences and a growing body of research.

In April 2026, the Department of Justice moved FDA-approved cannabis medicines and qualifying state-regulated medical marijuana into Schedule III. The government also began a separate proceeding to consider moving cannabis more broadly from Schedule I to Schedule III.

That change did not federally legalize marijuana, erase convictions or end the conflict between federal law and state adult-use programs. Adult-use cannabis remains federally prohibited, and comprehensive descheduling remains unfinished.

Robert Randall and the Medical Cannabis Movement

Robert Randall discovered in 1973 that cannabis appeared to reduce the intraocular pressure associated with his glaucoma. He was arrested in 1975 after authorities discovered cannabis plants he was cultivating in Washington, D.C.

In 1976, Randall successfully argued that his cannabis use was medically necessary. He subsequently became the first person in the modern federal era to receive government-supplied marijuana for medical use.

His case helped establish the federal Compassionate Investigational New Drug program. Participating patients received cannabis grown under federal contract at the University of Mississippi and distributed through federal research channels.

Randall’s story corrected a glaring contradiction: the federal government claimed cannabis had no accepted medical use while simultaneously supplying cannabis to individual patients.

High Times and Cannabis Culture

Tom Forcade founded High Times magazine in 1974.

The magazine gave cannabis culture a national platform and helped connect consumers with political organizing, cultivation knowledge and reform campaigns. At a time when mainstream coverage generally portrayed cannabis users as criminals or caricatures, cannabis media allowed the community to speak for itself.

Proposition 215 Changes American Medicine

On November 5, 1996, California voters approved Proposition 215, the Compassionate Use Act, with approximately 55.6% of the vote.

The law protected qualifying patients and their primary caregivers from certain state criminal penalties for possessing and cultivating marijuana upon a physician’s recommendation. It did not automatically create the fully regulated dispensary system that exists in California today; later laws supplied additional rules.

Proposition 215 was nevertheless a historic breakthrough. California became the first state to provide broad legal protection for medical cannabis patients, inspiring successful campaigns across the country.

The victory was built by patients, AIDS activists, caregivers, physicians and reformers—including Dennis Peron, Brownie Mary Rathbun, Valerie Corral, Dale Gieringer and many others—who forced the public to see cannabis prohibition through the experiences of seriously ill people.

Colorado and Washington Legalize Adult Use

On November 6, 2012, voters in Colorado approved Amendment 64, while voters in Washington approved Initiative 502.

These were the first successful state measures establishing legal adult cannabis possession and regulated commercial markets. Legal retail sales began in Colorado on January 1, 2014, and in Washington in July 2014.

Hemp Returns Through the 2018 Farm Bill

President Donald Trump signed the Agriculture Improvement Act of 2018 on December 20, 2018.

Commonly known as the 2018 Farm Bill, the legislation removed federally defined hemp—cannabis containing no more than 0.3% delta-9 THC on a dry-weight basis—from the Controlled Substances Act. It authorized regulated hemp cultivation under federal, state and tribal programs.

The law did not legalize marijuana, but it ended the federal treatment of compliant hemp as a Schedule I controlled substance and reopened a national agricultural industry suppressed for generations.

Florida’s Cannabis-Reform History

Florida’s modern movement developed through patient advocacy, legislative campaigns, court challenges, grassroots organizations and repeated ballot initiatives.

On June 16, 2014, Governor Rick Scott signed Senate Bill 1030, the Compassionate Medical Cannabis Act of 2014. The law created a highly restrictive program allowing certain patients to access low-THC cannabis.

That same year, Florida voters considered a broader medical-marijuana constitutional amendment. The measure received approximately 57.6% of the vote on November 4, 2014. Although a clear majority voted yes, it failed because Florida requires constitutional amendments to receive at least 60%.

Suncoast NORML was co-founded in 2014 by Christopher Cano and Carlos Hermida amid this growing Florida medical-marijuana movement. The chapter advocated not only for limited patient access but for complete legalization, decriminalization and normalization.

Florida voters returned to the issue on November 8, 2016. Amendment 2 received approximately 71.3% of the vote, creating constitutional protections for a much broader medical-marijuana program.

Lawmakers initially prohibited smoking medical cannabis. Governor Ron DeSantis signed Senate Bill 182 on March 18, 2019, eliminating that statutory prohibition and allowing qualified physicians to authorize smokable medical marijuana under state law.

Florida’s next major adult-use vote came on November 5, 2024. Amendment 3 received a majority—approximately 56%—but fell short of Florida’s 60% requirement. The result showed both the strength of public support and the work still ahead.

Cannabis Reform Is a Civil-Rights Issue

The cannabis movement has never been solely about the legal status of a plant. It is also about who has been arrested, who has lost employment, who has been separated from family, who has been denied housing and who has carried a criminal record.

Cannabis laws have historically been enforced unequally. Black Americans have experienced disproportionately high marijuana-arrest rates despite broadly similar rates of use between racial groups.

Legalization without expungement, resentencing and equitable participation leaves part of prohibition’s damage untouched. That is why modern reform increasingly includes criminal-justice repair, consumer protections, home cultivation, employment rights, medical access and opportunities for communities harmed by enforcement.

How Cannabis and Humanity Changed Each Other

Cannabis itself also changed through human cultivation.

For thousands of years, people selected plants for different characteristics: stronger fiber, larger seeds, resin production, aroma, growth patterns and cannabinoid content. Modern cannabis is therefore the product of both natural evolution and deliberate human breeding.

Science has also advanced far beyond the claim that only THC and CBD are understood. Researchers have identified more than 100 phytocannabinoids, although many remain understudied. THC and CBD are the best known, but compounds such as CBG, CBC, THCV and CBN are also subjects of scientific research.

Likewise, the statement that THC evolved specifically because its bitter taste repelled herbivores is too certain. Plant cannabinoids and trichomes may contribute to protection from ultraviolet radiation, pests, pathogens and environmental stress, but their evolutionary roles remain subjects of research.

Humans possess an endocannabinoid system involving cannabinoid receptors, endogenous signaling molecules and metabolic enzymes. It contributes to the regulation of processes including pain, appetite, mood, memory, immune activity and stress responses. Its existence helps explain how cannabinoids can produce biological effects, but it does not mean that cannabis evolved intentionally for human use.

Evolution has no plan. Humans found value in cannabis and repeatedly selected the plants that best served their needs.

The Cannabis Movement Today

The movement has achieved changes that once seemed politically impossible. Medical cannabis laws spread across most of the country. Numerous states legalized possession for adults. Hemp returned to American agriculture. Federal policy finally began acknowledging the medical use of cannabis.

But the work is incomplete.

Federal prohibition still affects consumers, researchers, veterans, patients, immigrants, workers and licensed businesses. Past convictions continue to restrict lives. Florida patients remain subject to a tightly controlled system, adult-use legalization remains unresolved and home cultivation is still prohibited for most residents.

The lesson of cannabis history is that reform does not happen automatically. Every major victory—from NORML’s founding to Proposition 215, Florida Amendment 2 and modern federal reform—came because people organized, educated their communities, challenged misinformation and refused to accept unjust laws as permanent.

Frequently Asked Questions About Cannabis History

When did humans first begin using cannabis?

Archaeological evidence shows that humans used cannabis in prehistoric Asia thousands of years ago. Precise dates remain debated because ancient fibers, seeds and pottery impressions can be difficult to identify conclusively.

Did an ancient Chinese emperor write about medical cannabis in 2700 BCE?

Cannabis medicine is traditionally associated with the legendary Emperor Shennong. However, the surviving Chinese materia medica attributed to him was compiled much later, probably during the first or second century CE, from older traditions.

When did cannabis become illegal federally?

The Marihuana Tax Act took effect on October 1, 1937, using taxes and registration requirements to suppress cannabis. The Controlled Substances Act, signed on October 27, 1970, established the modern federal scheduling system.

When was NORML founded?

Attorney Keith Stroup founded NORML in 1970. The Playboy Foundation provided the organization’s initial major funding in early 1971.

What was the first state to legalize medical marijuana?

California became the first state to enact broad medical-cannabis protections when voters approved Proposition 215 on November 5, 1996.

What were the first states to legalize adult-use cannabis?

Colorado and Washington voters approved adult-use legalization measures on November 6, 2012.

When did Florida legalize medical marijuana?

Florida enacted a limited low-THC program in 2014. Voters approved the broader medical-marijuana Amendment 2 on November 8, 2016. Smokable medical cannabis became legal for qualified patients on March 18, 2019.

Is cannabis federally legal today?

No. Federal policy changed in April 2026 by moving FDA-approved cannabis medicines and qualifying state-regulated medical cannabis into Schedule III, but adult-use marijuana remains federally prohibited and cannabis has not been comprehensively legalized or descheduled.

The Next Chapter Is Ours to Write

Cannabis history is not a straight line from ancient medicine to modern dispensaries. It is a history of agriculture, medicine, migration, racism, propaganda, criminalization, resistance and democratic reform.

It is also unfinished.

Suncoast NORML continues the work started by the activists who came before us: protecting patients, defending responsible consumers, correcting misinformation and fighting for a Florida where adults are no longer punished for choosing cannabis.

We encourage readers to support Suncoast NORML, follow the latest cannabis-policy developments and visit National NORML for legislation, research, legal resources and cannabis news from the organization that gave America’s cannabis consumers a voice.

Legalization is not inevitable. It happens when people understand the history, learn from it and organize to change what comes next.