This report presents the first information from the 2002 National Survey on Drug Use and Health (NSDUH), an annual survey of the civilian, noninstitutionalized population of the United States aged 12 years old or older. Prior to 2002, the survey was called the National Household Survey on Drug Abuse (NHSDA). This initial report on the 2002 data presents national estimates of rates of use, numbers of users, and other measures related to illicit drugs, alcohol, and tobacco products. Measures related to mental health problems also are included. The results from the 2002 NSDUH are given in this report, which has separate chapters that discuss the national findings on eight topics: use of illicit drugs; use of alcohol; use of tobacco products; trends in lifetime use of substances; trends in initiation of substance use; prevention-related issues; substance dependence, abuse, and treatment; and mental health. A final chapter summarizes the results and discusses key findings in relation to other research and survey results. Technical appendices describe the survey, provide technical details on the survey methodology, discuss the effects of survey protocol changes on trend measurement, offer key NSDUH definitions, discuss other sources of data, list the references cited in the report (as well as other relevant references), and present selected tabulations of estimates. (Contains 132 references, 90 tables, and 51 figures.) (GCP)