RT Book, Section A1 Hasin, Deborah S. A1 Samples, Hillary A2 Boulton, Matthew L. A2 Wallace, Robert B. SR Print(0) ID 1182669420 T1 Marijuana Use in the U.S.: Trends, Consequences, Changing Laws T2 Maxcy-Rosenau-Last Public Health & Preventive Medicine, 16e YR 2022 FD 2022 PB McGraw Hill PP New York, NY SN 9781259644511 LK accessmedicine.mhmedical.com/content.aspx?aid=1182669420 RD 2024/04/19 AB This chapter aims to provide a broad overview of marijuana use and related disorders. The chapter begins with two sections, one providing historical background information and the other, current context in terms of public attitudes and laws. The next section reviews evidence for additional adverse health effects associated with marijuana use, including physical, mental, and psychosocial outcomes,1 while considering the strength of research findings to date. The following section provides information on recent trends in perceptions of harmfulness, cannabis potency, trends in adolescent use and the relationship of this to changing marijuana laws, and corresponding information about adult use and specific subgroups. Finally, clinical implications are presented in the context of current epidemiologic evidence and trends over time in an evolving legal and social landscape.