Harvard Medical School Guides

Harvard Medical School Guide: Medical Marijuana

  © Moussa81 | Getty ImagesBack to the future In 19th-century America, it was common to use medicinal extracts of the plant Cannabis sativa (marijuana) to treat a variety of health conditions. In 1850—when cannabis was added to a compilation of medicines in common use called the U.S. Pharmacopeia—it was considered mainstream medicine throughout the Western world. Liquid hemp extracts were among a plethora of medicines people could freely buy off the shelf. In those days before…

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