All participants were administered a modified version of the SSAGA (Bucholz et al., 1994), an interview developed by COGA, which was used to diagnose DSM-IV alcohol and other substance dependence and abuse and to collect demographic, medical, psychiatric, alcohol, nicotine, and other drug-use history. This modified version of the SSAGA included questions assessing each of the DSM-IV substance dependence symptoms as applied to tobacco use as well as a question assessing whether these symptoms occurred within a 12-month period to allow for the assignment of DSM-IV diagnoses of nicotine dependence. Participants that did not meet criteria for DSM-IV nicotine dependence included those that had never smoked as well as those that had smoked but did not meet full diagnostic criteria. Only sections of the SSAGA assessing DSM-IV alcohol and substance misuse diagnoses were administered due to time constraints.
