Singh S, et al. - Researchers investigated pregnant women for the prevalence of recreational cannabis use, health outcomes associated with prenatal recreational cannabis use, and the possible influence of recreational cannabis legalization on this population. They included 41 publications. Substantial variation in the overall prevalence of prenatal cannabis use was noted (min-max: 0.24–22.6%); the greatest use was reported in the first trimester. As per the three studies with temporal data available, there has been an increase in the rates of prenatal cannabis use across years. Findings suggest a possible correlation between cannabis use among pregnant women and adverse neonatal outcomes. In future studies, they suggest assessing the gestational age and frequency of cannabis exposure, and usage patterns prior to and following legalization.