Citing lack of data on the health affects of cannabis use on pregnant women, the researchers "investigated trends of prenatal marijuana use from 2009-2016 using data from a large California health care system with universal screening via self-report and urine toxicology".
The proportion of women there who used marijuana in some form while they were pregnant almost doubled between 2009 and 2016. For pregnant teens under 18, marijuana use climbed from 12.5 percent to 21.8 percent. From 2009 to 2016, marijuana use among moms-to-be jumped from 4.2% to 7.1%, the study said.
More than 20 percent of pregnant teenagers tested positive, and 19 percent of expectant mothers between 18 and 24 had used marijuana while they were pregnant.
One study from JAMA says pregnant females in California are increasingly using marijuana during pregnancy.More news: Giants Landon Collins on Eli Apple
A new study reveals that more pregnant woman are turning to the use of marijuana.
According to the Centers for Disease Control, doctors caution that marijuana's effects on a fetus aren't clear, but could include low birth weight and developmental problems.
On January 1, 2018, marijuana will become legal for recreational use in California, making it easier to buy for anyone over 21 there.