They distort perception, which can lead users to harm themselves or others. Drugs also effect sensation and impair memory. In addition, there are specific health risks associated with particular types of drugs. 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. Injecting cocaine with contaminated equipment can cause AIDS, hepatitis, and other diseases. Preparation of free base, 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 desired effect.