• Joel Swendsen, Kevin P Conway, Louisa Degenhardt, Meyer Glantz, Robert Jin, Kathleen R Merikangas, Nancy Sampson, and Ronald C Kessler.
• National Scientific Research Center, Bordeaux, France. joel.swendsen@u-bordeaux2.fr
• Addiction. 2010 Jun 1; 105 (6): 1117-28.

AimsThe comorbidity of mental disorders and substance dependence is well documented, but prospective investigations in community samples are rare. This investigation examines the role of primary mental disorders as risk factors for the later onset of nicotine, alcohol and illicit drug use, abuse and dependence with abuse.DesignThe National Comorbidity Survey (NCS) was a nationally representative survey of mental and substance disorders in the United States carried out in 1990-92. The NCS-2 re-interviewed a probability subsample of NCS respondents in 2001-03, a decade after the baseline survey.ParticipantsA total of 5001 NCS respondents were re-interviewed in the NCS-2 (87.6% of baseline sample).ResultsAggregate analyses demonstrated significant prospective risks posed by baseline mental disorders for the onset of nicotine, alcohol and illicit drug dependence with abuse over the follow-up period. Particularly strong and consistent associations were observed for behavioral disorders and previous substance use conditions, as well as for certain mood and anxiety disorders. Conditional analyses demonstrated that many observed associations were limited to specific categories of use, abuse or dependence, including several mental disorders that were non-significant predictors in the aggregate analyses.ConclusionsMany mental disorders are associated with an increased risk of later substance use conditions, but important differences in these associations are observed across the categories of use, abuse and dependence with abuse. These prospective findings have implications for the precision of prevention and treatment strategies targeting substance use disorders.

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