Marijuana Marijuana is a product of the Cannabis plant which has been proven to have been used for medical purposes for thousands of years. Although it was known that Marijuana had been used as medicines in the past, it was not really known in what capacity. This led some to say that it did not really have a medical use, it just made a patient feel better due to the high and hallucinations that Marijuana could induce. This, in turn, led people to say that Marijuana was, in fact, bad for you. ...