Women who use marijuana during pregnancy are putting their babies at risk, a study published Thursday finds.
Babies born to women who were heavy cannabis users during pregnancy are more likely to have health problems, including premature birth and death within a year of birth, compared to babies born to women who did not use cannabis during pregnancy, according to an analysis of nearly 5 million California women who gave birth between 2001 and 2012.
The report in the journal Addiction is more evidence of the risks of marijuana use during pregnancy. As more states legalize adult use of recreational marijuana, researchers have been trying to determine whether the drug might have deleterious effects on fetuses. A study published in August linked pot use among pregnant women with an elevated risk of autism in their babies.
It’s not known how many pregnant women are using marijuana, nor how many might be heavy users. Earlier research showed that the number of pregnant women using cannabis doubled between 2002 and 2016, from 3.4 percent to 7 percent. That’s probably an underestimate, the researchers noted.
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