The authors examined the effects of heavy adolescent marijuana use on employment, marriage, and family formation and tested both dropping out of high school and adult marijuana use as potential mediators of these associations among a community sample of African Americans followed longitudinally from age 6 to age 32-33. They used propensity score matching to reduce selection bias when estimating the effects of heavy adolescent marijuana use. Logistic regression results on the sample matched on sex, and early demographic and behavioral variables showed that adolescent marijuana use has adult social behavioral consequences: Use of marijuana 20 times or more during adolescence was associated with being unemployed and unmarried in young adulthood and having children outside of marriage for both males and females. Dropping out of high school and more frequent adult marijuana use seem to be important parts of the pathway from adolescent marijuana use to negative life outcomes. Keywords adolescent marijuana use; social behavioral functioning; longitudinal studies; long-term consequences Marijuana is the most common of all illicit substances used by adolescents. Findings from the Monitoring the Future Survey, a national annual survey of students, show that over 20% of high school seniors report current use, 34% report use in the past year, and almost half (45%) report lifetime use of marijuana (Johnston, O'Malley, Bachman, & Schulenberg, 2005). Although the literature consistently discusses the widespread nature of adolescent marijuana use and the risk factors associated with use, considerably less is known about the effects of adolescent marijuana use on later functioning (Brook, Adams, Balka, & Johnson, 2002;Newcomb, 1997), especially in minority populations (Beauvais & Oetting, 2002). Even though many of the concurrent effects that result from teenage drug use (e.g., memory and attention impairment, risky decision making, driving injuries and fatalities, delinquentCorrespondence concerning this article should be addressed to Kerry M. Green, who is now at the Department of Health, Behavior, and Society, Bloomberg School of Public Health, Johns Hopkins University, 624 North Broadway, Baltimore, MD 21205. kgreen@jhsph.edu.
HHS Public Access
Author Manuscript Author ManuscriptAuthor ManuscriptAuthor Manuscript activities, and estrangement from traditional institutions) have been supported empirically (see Hall & Solowij, 1998, for review), longer term consequences of adolescent drug use and the mechanisms explaining such effects are not well understood. Although most teenage marijuana use is time-limited and typically ends by one's mid-20s (Bachman, Wadsworth, O'Malley, Johnston, & Schulenberg, 1997), it is unclear if effects persist after use desists or even develop later in life. This information would be useful in developing drug prevention and intervention programs.Because adolescence is an important time for the development of skills necessary to function as an adult in society, marijuana use, especially hea...