Marijuana and motivation / Larissa Reck and F. Richard Ferraro -- Medical marijuana: medical necessity vs. political agenda / Peter A. Clark, Kevin M. Capuzzi, Cameron Fick -- The effects of marijuana legalization on public health and usage among college-age young adults / Teminijesu Ige, Bradley Fevrier, and Laura Nabors -- Legalization and the effect on youth: articulating a clear and effective marijuana policy / Stephen M. Miller -- Health and safety warnings for legally sold marijuana / John M. Malouff -- Marijuana regulation, policy and arrest disparities: their impact on recidivism and negative public and mental health outcomes among African Americans / Torrance T. Stephens, Unity Harris -- Commentary: Marijuana and video games: real addictions? / Geoffrey L. Ream