Researchers have found that the number of women in the United States who use cannabis during pregnancy is increasing, according to a study published this week in the medical journal JAMA. Cannabis use during the first trimester of pregnancy was especially prevalent, researchers determined.

To conduct the study, researchers used self-reported data from the National Survey of Drug Use and Health from 2002 through 2017. The percentage of pregnant women who had used cannabis the month prior to completing the survey increased from 3.4 percent in 2002 to 7 percent in 2017. Past-month marijuana usage by women during the first trimester of pregnancy increased from 5.7 percent to 12.1 percent.

The researchers performing the study analyzed data from women 12 to 44 years old who responded to the survey. The respondents included 4,400 pregnant women and 133,900 women who were not pregnant at the time they participated in the survey. The study determined that women were using cannabis during pregnancy for both medical and nonmedical reasons.

Participants in the survey were asked about their current pregnancy status, their marijuana use during the past month, the number of days of marijuana use in the previous month, and daily or near daily

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