Cannabis is a drug that comes from Indian hemp plants such as Cannabis sativa and Cannabis indica. The active chemical in cannabis is THC (delta-9 tetrahydrocannabinol).
Cannabis is a depressant drug. Depressants do not necessarily make the person feel depressed. Rather, they affect the central nervous system by slowing down the messages going between the brain and the body.
See the Australian Drug Foundation - Drug Info clearinghouse website for futher information on Cannabis.
Cannabis is commonly refered to as: