Marijuana has many different names - pot, weed, mary jane, ganja, and cannabis.Marijuana has many different names - pot, weed, mary jane, ganja, and cannabis. It is a plant that is made up of many psychoactive compounds that can both be dangerous and beneficial to us. It is usually seen on TV or photos in plant form, but there are also other marijuana forms in existence, especially once they are harvested and processed, that you may want to know about. Marijuana can be available as kief or ...