MODEL RELEASED. Cocaine user. Man with his head in his hands over several lines of powdered cocaine (white) and a rolled-up bank note. The credit card has been used to divide the cocaine into lines. Cocaine is an illegal drug taken for its stimulant effects. One way of using this drug is to inhale the powder into the nose through a rolled-up bank note. The drug then enters the bloodstream through the membranes of the nose and sinuses. Excessive use can lead to problems such as addiction, paranoid delusions, and fatal overdoses.