Jarlenski M, et al. – Time trends in the perception of risk of regular marijuana use among U.S. pregnant and non–pregnant reproductive–age women is explored in this study. Based on these outcomes, the perception that regular marijuana utilization has no risk has increased threefold from 2005–2015 among U.S. reproductive–age women. Pregnant and non–pregnant women who utilized marijuana in the prior 1 month more commonly perceived that regular use had no risk, relative to women who had no such marijuana use. However, the perception that regular marijuana utilization has no risk increased even among women without marijuana use in the prior 1 month. They relied on self–reported marijuana use, which might underestimate the true prevalence. Women were asked about the perception of risk of marijuana use generally, and not particularly about perinatal marijuana utilization.