Family history measures for alcohol, drug, depressive and behavioral problems were constructed based on questions for 14 different types of 1st and 2nd degree relatives, asked during the Wave 1 interview following introductory statements that summarized the types of problems to be considered (e.g., the criteria for alcohol use disorders, major depression, etc.). These questions asked whether the relative(s) had ever experienced problems of the sort described. For alcohol problems, a family history density variable was constructed using the algorithm proposed by Stoltenberg et al. (1998). Dichotomous variables were constructed to reflect any versus no family history of depressive, behavioral and drug problems. Baseline past-year smokers were defined as individuals who reported use of cigarettes, cigars, pipe tobacco, snuff or chewing tobacco in the year preceding the Wave 1 interview. Baseline past-year illicit drug users were defined as those who reported non-prescription use of sedatives, tranquilizers, painkillers or stimulants or any use of marijuana, cocaine/crack, hallucinogens, inhalants/solvents, heroin or other illicit drugs in the year preceding the Wave 1 interview. Individuals were classified with baseline past-year nicotine or drug dependence
