Objective. To examine the progression of tobacco use and the patterns of co
morbidity of tobacco use and psychiatric disorders. Method: The authors con
ducted analyses of prospective and retrospective reports, collected from 19
88 to 1998, of a sample of high- and low-risk youths identified on the basi
s of the presence or absence of a parental history of substance abuse or de
pendence. Results: A parental history of substance use disorders was associ
ated with regular tobacco use and nicotine dependence, but not with experim
entation for all youths. Individual and composite psychiatric diagnoses wer
e strongly associated with nicotine dependence, but not with regular use or
experimentation. While the presence of an affective disorder and drug abus
e/dependence generally increased the risk for co-occurring nicotine depende
nce, analyses based on the temporal onset of disorders showed that it was t
he initiation of alcohol or drug use that predicted the progression to nico
tine dependence. For low-risk youths, oppositional defiant disorder was the
single psychiatric risk factor that predicted the transition to nicotine d
ependence. Conclusions: This study adds to the accumulating evidence that h
as Implicated comorbid psychiatric disorders in the etiology and subsequent
course of nicotine dependence. In addition, family history may represent a
n important indicator of an increased risk for nicotine dependence.