They distort perception, which can lead users to harm themselves or others. Drug use also affects sensation and impairs memory. In addition to these general effects, specific health risks associated with particular types of drugs are discussed below. Cocaine use is the fastest growing drug problem in the United States. One reason for this is the ready availability of cocaine in a cheap but potent form called crack or rock.
Cocaine stimulates the central nervous system.
Its immediate effects include dilated pupils and elevated blood pressure, heart rate, respiratory rate, and body temperature. Occasional use can cause a stuffy or runny nose, while chronic use can ulcerate the mucous membrane of the nose. Preparation of freebase, which involves the use of volatile solvents, can result in death or injury from fire or explosion. In addition, tolerance develops rapidly thus leading to higher and higher doses to produce the desire effect. Crack or freebase rock is a purified form of cocaine that is smoked.