A brief history of the control and use of cannabis in the United States is presented. Essential to the discussion are the federal law: the Marihuana Tax Stamp Act of 1937; the Controlled Substances Act of 1970; and the Federal Food, Drug and Cosmetic Act of 1962. On mandate of Congress in 1968, initial studies were directed to determine effects of long‐term use in man. The annual reporting of the status of “Marihuana and Health” was established. In the early 1970s, the scope of research was broadened to include evaluation of THC for use in certain medical conditions. Interest in therapeutic research may have been influenced by anecdotal reports of benefit for nausea and vomiting of cancer chemotherapy and forelevated intraocular pressure of glaucoma, by the lobbying for laws to legalize marihuana by special interest groups, and by the passage of state “Controlled Substances Therapeutic Research” acts (CSTRA). A listing of approved INDs in four therapeutic categories, a chart comparing the components of laws passed by 25 states, and a bibliography of suggested reading for further contact with the subject matter are included.