Smoking marijuana is on the rise among pregnant women in California, a new study has found.

he study, published in the Journal of the American Medical Association, used the medical records of 279,000 women residing in California who were on Kaiser Permanente, a health care service, Reuters reported.

Participating women were asked to answer a questionnaire and go through a drug test to see if they tested positive for marijuana use. Researchers found that marijuana consumption among pregnant women in the state has risen from 2009 to 2016 from 4.2 percent to 7.1 percent.

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