In 1979, 18 percent of all youths aged 12-17 used illicit drugs. In contrast, by 1991, only 7 percent were using illicit drugs. However, prevention efforts must continue because new young people continuously come into each age group, some youths have initiated drug use and require more intensive efforts, and some audiences are less at risk than others. The main prevention strategies include information dissemination, prevention education, alternative activities, problem identification and referral, community- based efforts, and an environmental approach focusing on written and unwritten community standards and attitudes. Studies on disapproval of drug use, cessation of use by those who have tried drugs, and other factors all indicate the effectiveness of prevention programs. Materials to assist in drug prevention efforts are available from the National Clearinghouse for Alcohol and Drug Information. Tables, figures, and footnotes