It’s well known smoking cigarettes during pregnancy can increase the risk of harm to the baby and is best avoided.

But in our research, published [...] in the Medical Journal of Australia, we show using cannabis during pregnancy is also associated with poorer outcomes for babies. While we don’t have data on how common cannabis use is during pregnancy, results from the 2016 Australian National Drug Strategy Household Survey showed 10-20% of women of reproductive age had used cannabis during the preceding 12 months.