Findings from this paper add to the current understanding of the temporal changes in perceived risk of cannabis use, and the correlates of perceived risk, in a U.S. nationally representative sample. Perceived great risk of regular cannabis use varied significantly between 2002–2012 in the U.S. among the population ages 12 and older as a whole, among both men and women, as well as among most race/ethnicities and most age subgroups. The prevalence of perceived great risk was noticeably higher among past year non-users than past year cannabis users, consistent with previous examinations of perceived risk (Kilmer et al., 2007; Lopez-Quintero and Neumark, 2010). Nonetheless, perceived great risk of regular use varied between 2002–2012 among both past year non-users and past year non-daily users of cannabis. Perceived risk varied significantly among past year daily users overall, though this finding seems to be carried by significant findings only for individuals ages 18–25. When examining past year cannabis use, non-daily and daily cannabis use increased modestly (i.e., <1% for the sample overall), but significantly between the two time points. In terms of sex
