Cocaine belongs to the group of drugs known as stimulants.
Cocaine is most commonly seen as a white powder called cocaine hydrochloride. The powder is extracted from the leaves of the coca bush which is mainly found in Peru and Bolivia. This is then processed with various chemicals. Crack is a very pure form of free base cocaine sold in the form of small crystals or rocks, and smoked. Since cocaine is illegal, there is no controls over factors such as strength and purity of the drug.