Cocaine is made from the leaf of the coca plant. It often comes in the form of a white powder that some people inhale through their nose. Another form of cocaine, known as crack, can be smoked. PDF for Mind Over Matter - Cocaine [PDF - 806 KB] The Brain's Response to Cocaine Miscommunication in the Brain Cocaine Can Change the Way the Brain Works Cocaine Tightens Blood Vessels Scientists Discover Answers The Search Continues The Brain's Response to Cocaine › Español