Book excerpt: Presents info. from the 2007 Nat. Survey on Drug Use and Health; this survey was formerly called the Nat. Household Survey on Drug Abuse. This survey is the primary source of info. on the use of illicit drugs, alcohol, and tobacco products by the civilian, non-institutionalized population of the U.S. aged 12 years old or older. The survey interviews approx. 67,500 persons each year. This initial report on the 2007 data presents nat. 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. A major focus of this report is a comparison of substance use prevalence estimates between 2006 and 2007. Trends since 2002 also are discussed.