
The Emergence of Medical Cannabis Movements in the Late 20th Century
Introduction
The knowledge of cannabis worldwide underwent a sea change in the late 20th century, especially with regard to its medical applications. The stigma surrounding cannabis, shaped by decades of prohibition and political agendas, began to shift as patient advocacy, scientific research, and growing public awareness propelled the discussion toward cannabis’s potential medical benefits. This movement was not solely driven by ideological shifts but by necessity—patients suffering from debilitating conditions like cancer, HIV/AIDS, and chronic pain sought alternatives to conventional treatments. This detailed exploration traces the origins, rise, and significance of the medical cannabis movement in the late 20th century, emphasizing medical use and excluding recreational contexts and consumption methods.
Early 20th Century: Cannabis Prohibition and the Decline of Medical Use

At the start of the 20th century, cannabis was commonly included in many pharmacopeias. It had been used for centuries across cultures for medicinal purposes, treating conditions such as chronic pain, digestive issues, and inflammatory diseases. However, cannabis’s legal and medical standing began to deteriorate in the early 1900s, largely due to a combination of social, racial, and political factors.
The Rise of Anti-Cannabis Sentiment
In the U.S., the 1937 Marijuana Tax Act marked the beginning of cannabis prohibition, effectively curtailing both its recreational and medical uses by imposing heavy taxes and strict regulations. Cannabis was demonized in media and politics, largely as part of a racially charged narrative that associated its use with marginalized communities. These developments culminated in cannabis being classified as a Schedule I substance under the Controlled Substances Act of 1970, signifying that it had no accepted medical use and a high potential for abuse. This classification made it extremely difficult to conduct scientific research on cannabis and its potential medical benefits, setting back medical exploration for decades.
The Decline of Cannabis in Medicine
As cannabis became increasingly associated with criminality and societal deviance, its medical use waned. Physicians in the U.S. and many other countries could no longer legally prescribe or study cannabis. Its removal from official pharmacopeias further severed ties between medical professionals and cannabis, erasing centuries of medicinal knowledge. During the mid-20th century, pharmaceutical advancements led to the development of synthetic alternatives to plant-based medicines, further diminishing the role of natural remedies like cannabis in conventional medical practices.
Rediscovery Through Science: The 1960s and 1970s
The mid-20th century, however, was not entirely devoid of progress in cannabis research. The 1960s and 1970s saw a resurgence in scientific curiosity about the plant, particularly as countercultural movements in the U.S. and Europe began to challenge societal norms, including drug laws.
Raphael Mechoulam and the Discovery of THC
In 1964, Israeli chemist Dr. Raphael Mechoulam made one of the most important breakthroughs in cannabis research by isolating delta-9-tetrahydrocannabinol (THC), the primary psychoactive compound in cannabis. Mechoulam’s research was instrumental in demystifying the plant’s chemical structure, opening the door to a scientific understanding of how cannabinoids interact with the human body.
Mechoulam’s work laid the foundation for the discovery of the endocannabinoid system (ECS) in the 1980s, a biological system within the human body that plays a crucial role in regulating pain, mood, appetite, and immune function. Understanding the ECS provided scientific validation for the anecdotal reports of cannabis’s efficacy in treating a wide range of medical conditions. This period saw an increase in medical interest in cannabinoids as potential therapeutic agents.
Early Studies on Medical Cannabis
Although cannabis was still classified as illegal in many parts of the world, small-scale research began to emerge, particularly around the therapeutic potential of THC. Early studies in the 1970s explored its ability to reduce nausea and vomiting in cancer patients undergoing chemotherapy, one of the earliest medically accepted uses of cannabis. Although limited in scope due to legal restrictions, this body of research laid the groundwork for later investigations into medical cannabis, eventually contributing to its acceptance in specific medical contexts.
The HIV/AIDS Crisis and the Compassionate Use Movement
The turning point for medical cannabis advocacy in the late 20th century came with the rise of the HIV/AIDS epidemic in the 1980s. Patients facing a terminal illness with limited treatment options found cannabis to be a crucial tool in managing the severe side effects of both the disease and the medications used to treat it. This public health crisis catalyzed the modern medical cannabis movement, bringing cannabis back into the medical spotlight after decades of stigmatization.
HIV/AIDS Patients and the Therapeutic Use of Cannabis
By the mid-1980s, HIV/AIDS patients reported that cannabis helped alleviate some of the most debilitating symptoms of the disease, including nausea, appetite loss, and chronic pain. Many patients found that cannabis could counteract the severe wasting syndrome (cachexia) that was common among those with advanced HIV/AIDS. Cannabis allowed patients to eat, regain strength, and maintain a higher quality of life.
As these benefits became more widely known within the HIV/AIDS community, patients and their caregivers began advocating for legal access to medical cannabis. Organizations like ACT UP (AIDS Coalition to Unleash Power) and Project Inform played significant roles in this advocacy, pushing for compassionate use of cannabis in treating AIDS-related symptoms.
Robert Randall and the First Federal Medical Cannabis Patient
One of the most significant figures in the early medical cannabis movement was Robert Randall, a glaucoma patient who became the first American to legally use cannabis for medical purposes. In 1976, Randall successfully sued the U.S. government under the doctrine of medical necessity, arguing that cannabis was the only treatment that could prevent him from going blind due to glaucoma. The court ruled in his favor, and the government initiated the Compassionate Investigational New Drug (IND) program, which allowed Randall and a small number of other patients to receive government-grown cannabis for medical use.
Though the program was limited, it represented a monumental step in the acknowledgment of cannabis’s medical potential. It set a legal precedent for medical necessity that would be invoked by future patients and advocates.
Formation of Grassroots Advocacy Groups

As the medical cannabis movement gained momentum in the 1980s and 1990s, a number of grassroots organizations emerged, advocating for patient access to cannabis and challenging restrictive laws. These groups played a pivotal role in reshaping public opinion and promoting legislative changes.
The National Organization for the Reform of Marijuana Laws (NORML)
Founded in 1970, the National Organization for the Reform of Marijuana Laws (NORML) initially focused on broader efforts to decriminalize cannabis but soon became a strong advocate for medical cannabis. NORML helped raise awareness about the medical benefits of cannabis, particularly through patient testimonials and public education campaigns. By the late 1980s, NORML had shifted much of its focus toward supporting medical cannabis patients and pushing for legal reforms that would allow greater access to the plant for therapeutic purposes.
Brownie Mary and the San Francisco Cannabis Buyers Club
Mary Jane Rathbun, affectionately known as “Brownie Mary,” became a legendary figure in the medical cannabis movement for her work distributing cannabis-laced brownies to AIDS patients in San Francisco during the 1980s. Despite facing legal repercussions for her actions, Rathbun continued her efforts, motivated by the relief she witnessed in patients who consumed her brownies.
Rathbun’s activism, along with that of fellow advocates like Dennis Peron, led to the creation of the San Francisco Cannabis Buyers Club, the first public dispensary in the U.S. to provide medical cannabis to patients. Peron, a Vietnam War veteran and longtime cannabis activist, was inspired to launch the club after seeing the benefits cannabis provided to his partner, who was suffering from AIDS. The Buyers Club quickly became a lifeline for thousands of patients in the San Francisco Bay Area and a model for future dispensary systems.
Legal Developments: The Compassionate Use Movement
The early legal victories for medical cannabis set the stage for more significant developments in the 1990s. As the AIDS crisis intensified and more patients sought cannabis as a therapeutic option, advocates began pushing for broader legal protections.
The Compassionate Use Act (Proposition 215)
In 1996, the Compassionate Use Act (commonly known as Proposition 215 in California) was passed, marking a significant turning point in the medicinal cannabis movement. The United States passed its first law allowing the use of cannabis for medicinal purposes. On a doctor’s recommendation, Proposition 215 permitted patients and their caregivers to possess and grow cannabis for medical purposes.
The law’s passage was largely due to the tireless efforts of Dennis Peron and other advocates who organized campaigns to garner public support for medical cannabis. Proposition 215 was a groundbreaking victory, providing a legal framework for patients in California to access cannabis without fear of prosecution under state law.
Other States Follow Suit
The passage of Proposition 215 in California sparked a wave of similar legislation across the United States. Between 1996 and 2000, several states, including Alaska, Oregon, Washington, and Maine, passed their own medical cannabis laws. Each of these states implemented different systems for regulating medical cannabis, but the common theme was the recognition of cannabis as a legitimate medical treatment.
These laws allowed patients with specific conditions, such as cancer, AIDS, glaucoma, and chronic pain, to obtain and use cannabis with a doctor’s recommendation. This marked a significant shift in the legal landscape and opened the door for broader acceptance of medical cannabis at both state and federal levels.
The Role of Research in Supporting the Movement
While patient advocacy was a driving force behind the medical cannabis movement, scientific research played an equally important role in legitimizing the therapeutic potential of cannabis. Despite the legal obstacles to conducting research, several important studies in the 1980s and 1990s helped to build a case for the medical use of cannabis.
Research on Chemotherapy-Induced Nausea and Vomiting
One of the most well-established medical uses of cannabis in the late 20th century was its ability to alleviate nausea and vomiting caused by chemotherapy. Several studies conducted in the 1980s demonstrated that cannabis was more effective than conventional antiemetic drugs at reducing these symptoms in cancer patients.
In 1985, the U.S. Food and Drug Administration (FDA) approved two synthetic forms of THC—dronabinol (Marinol) and nabilone—for the treatment of chemotherapy-induced nausea and vomiting. While these synthetic cannabinoids provided some relief to patients, many found that natural cannabis was more effective and had fewer side effects.
Glaucoma Research
Research in the 1970s and 1980s also explored the use of cannabis in treating glaucoma, a condition characterized by increased pressure in the eye that can lead to blindness. Early studies found that cannabis could reduce intraocular pressure, providing temporary relief for glaucoma patients.
Cannabis gave patients who did not respond to traditional treatments for glaucoma an alternative, even though it was not a cure for the condition. This research helped to strengthen the argument for cannabis as a legitimate medical option, particularly for patients with chronic, untreatable conditions.
International Developments in Medical Cannabis

Although much of the focus in the late 20th century was on the United States, other countries were also beginning to explore the potential of medical cannabis. International developments played a crucial role in shaping the global conversation around cannabis as medicine.
The Netherlands
The Netherlands was one of the first countries to take a progressive stance on cannabis. In 1976, the Dutch government decriminalized the possession of small amounts of cannabis, effectively creating a legal gray area where cannabis could be sold in “coffeeshops” but remained illegal under international law.
In 1999, the Dutch government took further steps by establishing a medical cannabis program that allowed patients to access cannabis through pharmacies. The program, administered by the Office of Medicinal Cannabis, provided a legal and regulated source of cannabis for patients with conditions such as multiple sclerosis, chronic pain, and chemotherapy-induced nausea. The Netherlands’ approach to medical cannabis set an international example and demonstrated that cannabis could be safely and effectively integrated into a healthcare system.
Canada
Canada also made significant strides in the late 20th century toward recognizing the medical use of cannabis. In 1999, the Canadian government introduced the Medical Marijuana Access Regulations (MMAR), which allowed patients with certain medical conditions to apply for legal access to cannabis.
Canada’s medical cannabis program provided a legal framework for patients to grow their own cannabis or obtain it from licensed producers. This program was one of the first of its kind and set the stage for further developments in medical cannabis policy in the 21st century.
Restrictions on Using Cannabis in the Medical Field in the Late 20th Century as a Last Resort
In the late 20th century, despite growing advocacy for medical cannabis, its use in the medical field was heavily restricted, often considered a last resort for patients who had exhausted all other conventional treatments. One of the primary barriers was cannabis’s classification as a Schedule I substance under the Controlled Substances Act of 1970, which designated it as having no accepted medical use and a high potential for abuse. This made it extremely difficult for doctors to prescribe cannabis or for researchers to study its therapeutic benefits.
In cases where cannabis was allowed, such as in the U.S. federal government’s Compassionate Investigational New Drug (IND) program, only a limited number of patients with life-threatening conditions like glaucoma or severe nausea from chemotherapy could access it. Even then, cannabis was seen as a treatment of last resort, to be considered only after other medications had failed. Physicians faced significant legal and professional risks when recommending cannabis, further restricting its use. Additionally, patients using cannabis had to navigate conflicting state and federal laws, leading to a patchwork of access across regions.
Overall, in the late 20th century, the use of cannabis in the medical field was tightly regulated, limited, and only available to patients with severe conditions who had few, if any, alternatives left.
Conclusion
The emergence of medical cannabis movements in the late 20th century was a pivotal moment in the history of cannabis, marking a transition from prohibition to recognition of its therapeutic potential. Patient advocacy, driven by the needs of those suffering from chronic and life-threatening conditions, played a central role in reshaping public perceptions and pushing for legal reforms. Scientific research, though limited by legal constraints, provided critical evidence supporting the medical use of cannabis.
From the early grassroots efforts of HIV/AIDS patients to the landmark passage of Proposition 215 in California, the late 20th century saw the foundations laid for the modern medical cannabis movement. These developments have had a lasting impact on the global conversation around cannabis, setting the stage for further advancements in medical cannabis policy and research.
While challenges remain—particularly in the ongoing legal conflict between state and federal laws in the U.S. and the need for more comprehensive clinical research—the progress made in the late 20th century represents a significant victory for patient rights and the recognition of cannabis as a valuable medical tool. Today, millions of patients around the world benefit from access to medical cannabis, a testament to the perseverance of those who fought for its acceptance as a legitimate medicine.
The legacy of the late 20th-century medical cannabis movements continues to shape the future of medicine, as research continues to uncover new therapeutic applications for cannabis and cannabinoids. The journey that began with grassroots advocacy has evolved into a global movement that is transforming the way we understand and use cannabis in healthcare.