From first drug use to drug dependence; developmental periods of risk for dependence upon marijuana, cocaine, and alcohol

Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology
Fernando A Wagner, James C Anthony

Abstract

The focal point of this paper is the transition from drug use to drug dependence. We present new evidence on risk for starting to use marijuana, cocaine, and alcohol, as well as risks for progression from first drug use to the onset of drug dependence, separately for each of these drugs. Data from the National Comorbidity Survey (NCS) were analyzed. The NCS had a representative sample of the United States population ages 15-54 years (n = 8,098). Survival analysis techniques were used to provide age- and time-specific risk estimates of initiating use of marijuana, cocaine, and alcohol, as well as of becoming dependent on each drug. With respect to risk of initiating use, estimated peak values for alcohol and marijuana were found at age 18, about two years earlier than the later peak in risk of initiating cocaine use. With respect to risk of meeting criteria for the clinical dependence syndrome, estimated peak values for alcohol and marijuana were found at age 17-18. Peak values for cocaine dependence were found at age 23-25. Once use began, cocaine dependence emerged early and more explosively, with an estimated 5-6% of cocaine users becoming cocaine dependent in the first year of use. Most of the observed cases of cocaine depen...Continue Reading

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