June 24, 2019, MedPage Today OB/GYN Update 

Women who reported exposure to cannabis during pregnancy had higher rates of preterm birth compared to unexposed women, researchers found.

Cannabis exposure in pregnant women in Canada was significantly associated with a higher risk of preterm birth (relative risk 1.41, 95% CI 1.36-1.47), reported Daniel J. Corsi, PhD, of Ottawa Hospital Research Institute in Canada, and colleagues.