An increasing number of women are using cannabis before becoming pregnant, as well as early in the pregnancy, according to a new study published Friday in the journal JAMA Network Open.
The findings, from Kaiser Permanente Northern California, are based on reports from 276,991 women living in California before recreational marijuana was legalized in that state. The women were asked about their cannabis use at their first prenatal visit.
The data showed that prevalence of women who reported using marijuana during the year before pregnancy grew from 6.8 percent in 2009 to 12.5 percent in 2017.
The number of women who said they used marijuana while pregnant was much smaller; however, that prevalence also increased from 1.9 percent in 2009 to 3.4 percent in 2017.
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