Marijuana is from the Mexican Spanish name marihuana. Marijuana is also known as Cannabis and various nicknames such as: ganja, weed, pot & grass. Marijuana, over centuries, has been used as a psychoactive drug and as medicine. The principal psychoactive constituent of marijuana is tetrahydrocannabinol (THC) and is one of 483 known compounds and at least 84 other cannabinoids; such as Cannabidiol (CBD). There are many Marijuana Strains grown today. The 3 main categories of marijuana strains are: Indica - Sativa - Ruderalis. Each strain has their own affects on the body and different illnesses they help cure.