Shih RA, et al. - Through secondary data analysis of 1,887 individuals aged 18–22 years who were surveyed online in 2016–2017 in Los Angeles County, CA, the researchers examined if the density of medical marijuana dispensaries (MMDs) around young adults’ homes impacts marijuana use outcomes. About 84% of participants had 10 or more MMDs within 4 miles of their houses. Living near a greater number of MMDs correlated with a higher number of days used in the past month and higher expectation of a positive impact from marijuana. In comparison with associations with the total MMD count, living near more MMDs with storefront signage had a four-to-six-fold greater impact on the number of times used per day and positive expectancies, respectively. An unexpected relationship was observed amongst higher MMD density and fewer number of times used each day. Living near more MMDs had a positive association with the more common use of marijuana within the past month and larger expectations of marijuana's positive benefits for young adults in Los Angeles County.