Characteristics Associated with Prenatal Cannabis Use Vary with Legality of Recreational Cannabis

Increasing prenatal cannabis use over recent years has been associated with changes in state-level cannabis policies. Yet, how correlates of prenatal cannabis use differ by recreational cannabis legality has not been examined. We aim to estimate prenatal cannabis use prevalence and examine how maternal factors associated with use vary across states with and without recreational cannabis legalization. In 2020, we performed a cross-sectional analysis using 2018 Pregnancy Risk Assessment Monitoring System data, providing population-level estimates of prenatal cannabis use among included states. Across 14 states, we examined characteristics of prenatal cannabis users via chi-square tests and multivariate logistic regression models. We present odds ratios (ORs) of prenatal cannabis use, stratified by recreational cannabis legality. Self-reported prenatal cannabis use in states with and without legalized recreational cannabis were 6.29% and 5.22%, respectively. Adjusted analyses found that regardless of recreational cannabis legalization, women who were unmarried, reported Medicaid as their prenatal care insurer, did not receive first trimester prenatal care, or reported having prenatal depression or anxiety were 1-4 times more likely to report prenatal cannabis use. Women residing in states where recreational cannabis was legal were significantly more likely to report concurrent cannabis and tobacco use while pregnant (OR: 8.66, 95% confidence interval [CI], 5.40-13.86) compared with women in states yet to legalize (OR: 5.49, 95% CI, 3.97-7.59). Our findings suggest a need for focused cannabis prevention efforts for nonpregnant women of reproductive age to stop initial uptake of the drug. Additionally, as women in these states were three times more likely to report concurrent cannabis and tobacco use during pregnancy, we recommend that states with recreational cannabis focus on prevention and intervention of cosubstance use among pregnant women.