News release: “Marijuana use among American adolescents has increased gradually over the past two years (three years among 12th-graders) following years of declining use, according to the latest Monitoring the Future study, which has tracked drug use among U.S. teens since 1975…The findings summarized here will be published in the forthcoming volume: Johnston, L. D., O’Malley, P. M., Bachman, J. G., & Schulenberg, J. E. (2010). Monitoring the Future national results on adolescent drug use: Overview of key findings, 2009 (NIH Publication No. [yet to be assigned]). Bethesda, MD: National Institute on Drug Abuse.”