Researchers (IMAGE) University of Western Ontario Caption Researchers Rachel Brown, an MSc Candidate, and Jamie Seabrook, PhD, studied health data from 25,000 pregnant women and have shown that depression is the largest driver of substance use during pregnancy. Credit Schulich Medicine & Dentistry, Western University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.