Marijuana is the most commonly used illicit substance under federal law in the United States; however, many states have legalized medical and adult nonmedical use. Evidence regarding the safety and health effects of cannabis use during pregnancy is largely inconclusive. Potential adverse health effects to exposed infants (e.g., lower birthweight) have been documented. To provide population-based estimates of use surrounding pregnancy, identify reasons for and mode of use, and understand characteristics of women who continue versus cease marijuana use during pregnancy, CDC analyzed data from eight states participating in the 2017 Pregnancy Risk Assessment Monitoring System marijuana supplement.
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