The proportion of women there who used marijuana in some form while they were pregnant nearly doubled between 2009 and 2016. In 2018, marijuana will be legally available for recreational use, suggesting that that even more pregnant women may have access to and indulge in it. In 2009, only about four percent of pregnant women were using marijuana. 'Of concern' to the researchers was that fact that marijuana use was particularly common among younger pregnant women. 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.

Source: Daily Mail December 27, 2017 17:48 UTC