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Exposure to the Above the Influence antidrug advertisements and adolescent marijuana use in the United States, 2006-2008.

OBJECTIVES
We examined the relationship between exposure to the Above the Influence antidrug campaign in 210 US media markets and adolescent marijuana and alcohol use from 2006 to 2008.


METHODS
We analyzed monthly advertising exposure (targeted rating points) data from the Office of National Drug Control Policy and drug use data from the Monitoring the Future study. We estimated multivariate logistic regression models of marijuana use for students in grades 8, 10, and 12, with controls for individual, family, and media market characteristics and year and regional fixed effects.


RESULTS
For eighth-grade adolescent girls, greater exposure to antidrug advertisements was associated with lower rates of past-month marijuana use (adjusted odds ratio [AOR] = 0.67; 95% confidence interval [CI] = 0.52, 0.87) and lower rates of lifetime marijuana use (AOR = 0.76; 95% CI = 0.62, 0.93), but not alcohol use (AOR = 1.00; 95% CI = 0.84, 1.19). Associations were not significant for adolescent boys or for students in grades 10 and 12.


CONCLUSIONS
Antidrug advertising may be an effective way to dissuade eighth-grade adolescent girls from initiating marijuana use.