When someone uses a stimulant, they act nervous, they are irritable and they are hyperactive. Based on the described behavior, I believe the individual is using cocaine. Cocaine is a powerful stimulant to the central nervous system in which hallucinations and paranoid delusions occur. Cocaine is derived from the leaves of coca plants. Some common nicknames for cocaine are blow, coke, crack and snow. Users feel an exhilaration and lasting euphoria when they use cocaine. Physically symptoms of cocaine users include a high pulse rate, excessive sweating and jitteriness. People often high on cocaine believe people are following them and/or are after them. The most common way people use cocaine is through sniffing or snorting the drug through