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We know little about the effect of prenatal cannabis use on maternal outcomes. In this study from the Kaiser Permanente Northern California health system, researchers compared maternal outcomes in 20,000 users and 300,000 nonusers of cannabis during pregnancies that occurred between 2011 and 2019. Prenatal cannabis use was determined by either self-report or positive confirmed toxicology results following universal pregnancy urine screening.
Key results included the following:
Cannabis users were younger and from lower socioeconomic groups than nonusers; they also had higher rates of mood disorders, substance use disorders, and smoking. Analysis of outcomes was adjusted statistically for these differences.
Prenatal cannabis use was associated …