Marijuana is a mind-alerting substance that comes from the Cannabis sativa plant. Other names for it are weed, pot and dope.
Marijuana is known by a variety of other names, including pot, tea, grass, and weed. It is usually dried and crushed and put into pipes or formed into cigarettes (joints) for smoking.
People sometimes use cannabis to treat health conditions. This is known as medical cannabis, also called medical marijuana. Cannabis contains chemicals called cannabinoids, which are the active compounds. There are more than 100 active compounds in cannabis.