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Medical marijuana laws and adolescent marijuana use in the USA from 1991 to 2014: results from annual, repeated cross-sectional surveys

Keyes, Katherine; Schulenberg, John E; O’Malley, Patrick M; Galea, Sandro; Hasin, Deborah S; Wall, Melanie; Cerdá, Magdalena; Pacula, Rosalie; Feng, Tianshu. (2015). Medical marijuana laws and adolescent marijuana use in the USA from 1991 to 2014: results from annual, repeated cross-sectional surveys. The Lancet Psychiatry. 2(7), 601-608.