More young women are using pot during pregnancy: study

A study of mothers-to-be in California found an increase in marijuana use especially among younger women.
Prenatal exposure to marijuana may impair fetal growth, wrote the authors of the study published in the Journal of the American Medical Association Tuesday.
Researchers looked at trends of prenatal cannabis use from 2009-2016 using data from a large California health-care system. 
Nearly 300,000 pregnant women at facilities in Kaiser Permanente Northern California responded to a su