The August 2015 Journal of Adolescent Health includes four articles about teen marijuana use.
Conclusion: Results support a growing body of work suggesting that frequent marijuana use (six or more times in the past 30 days) predicts a lower likelihood of post secondary educational attainment, and this difference may originate during secondary school.
Adolescents’ Perceptions of Risks and Benefits of Conventional Cigarettes, E-cigarettes, and Marijuana: A Qualitative Analysis
Conclusion: Adolescents have learned from multiple sources about risks of using cigarettes, but they receive much less and often incorrect information regarding marijuana and e-cigarettes, likely resulting in their positive and often ambivalent perceptions of marijuana and e-cigarettes.
Trends Among U.S. High School Seniors in Recent Marijuana Use and Associations With Other Substances: 1976-2013
Conclusion: Substance use recently declined among high school seniors, except for marijuana use, particularly among black youth. The increasing association between marijuana and other substances among black adolescents suggests further amplification in critical health disparities.
Conclusion: This study is the first to provide nationally representative data on three groups of adolescent marijuana users. Although most adolescents (who use marijuana) use illicit sources, more adolescents (who use marijuana) appear to be using diverted medical marijuana, than using medical marijuana legally.