It acts as a central nervous system depressant. Alcohol is absorbed into the bloodstream through the stomach and the small intestine. Caffeine Caffeine is a white, bitter, crystal-like substance found in coffee, tea, cola, and chocolate. Cocaine Cocaine is extracted from the leaves of the South American cocoa plant. Cocaine stimulates the central nervous system, increasing alertness and activity.
Cocaine is an addictive drug.
Marijuana Marijuana is the common name for the hemp plant, cannabis sativa. The amount of THC in a joint is what affects the user. Steroids Steroids may contribute to increases in body weight and muscular strength. Anabolic-Androgenic steroids are chemically related to the male sex hormone, testosterone. Anabolic means to build up the muscles and other tissues of the body.