A drug is, in the broadest of terms, a chemical substance that has known biological effects on humans or other animals. . Cannabis, also known as marijuana and by numerous other names, is a preparation of the Cannabis plant intended for use as a psychoactive drug or medicine. . Weed is not a drug. Although I don't use it (because I can't handle it), I don't care if others uses it. Get money Rihanna, because these whites are already in it.