Why use ? This is a question that perplexes many doctors of medicine and psychology. As an ex user, I feel that this topic is one that I have a personal interest in. I will start by defining what is. is a colorless or white crystalline powder extracted from coca leaves, occasionally used in medicine as a local anesthetic especially for the eyes, nose, or throat and widely used as an illicit drug for its euphoric and stimulating effects. It is a naturally occurring substance derived from the leaves of erythroxylon plants. is the worldâ ....