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More moms-to-be in the United States are using marijuana, especially in their first trimester, according to a study published Tuesday in the medical journal JAMA.

The percentage of pregnant women who reported using marijuana in the past month increased overall from 3.4% in 2002 to 7% in 2017. In the first trimester, past-month marijuana use increased from 5.7% to 12.1%. Pregnant women consistently reported more medical marijuana use in the first trimester than in the second or third trimesters.