The same survey methodology that was used in the past was also used in the 1993 survey. The sample design incorporated a national probability sample of households/dwelling units in the United States. For 1993, 117 primary sampling units were selected at the first stage of sampling. During data collection, each selected dwelling unit was visited; and the age, race, ethnicity, sex, and current smoking status of each resident 12 years old and older were recorded in a screening roster. Selected individuals were then asked to complete a voluntary interview. The survey yields estimates of the respondents' use of illicit drugs, alcohol, and tobacco at any time in the past, in the past year, and in the past month. One section of the report presents the basic set of estimates of the prevalence of drug use in the United States by several demographic variables for the combined drug use category that includes illicit or nonmedical use of any drug and for each major individual illicit drug. The use of licit drugs covers alcohol, cigarettes, and smokeless tobacco. Data are presented separately for the prevalence of PCP use; heroin use; anabolic steroid use; and the use of a needle with heroin, cocaine, or amphetamines. Another section focuses on how often a drug is used. Data are presented by gender, age, race, and region. 22 tables