Marijuana has been used worldwide as a source of rope, cloth, and paper; its medicinal qualities were first documented 4000 years ago in China. In the U.S., the Marijuana Tax Act of 1937 taxed marijuana out of existence. Independent medical tests of hemp only found it to be intoxicating, but not in a violent way. The 1970 Controlled Substances Act classified marijuana as possessing a high potentia… l of dependence and no medical benefits. Yet today, medicinal use of marijuana is on the upswing.