Cannabis and other drugs during pregnancy

Cannabis

It is recommended not to use cannabis or be exposed to second-hand smoke during pregnancy.

Cannabis can interfere with the growth of the fetus, which can result in lower birth weight. It may also affect brain development in the baby, leading to problems later during childhood and adolescence.

Cannabis affects the baby regardless of how it is used: smoked, vaped, eaten, or consumed in some other form.

Even though cannabis may relieve nausea in some people, it is not a safe solution during pregnancy. You will find advice on relieving pregnancy nausea in the table Nausea and vomiting.

It isn’t always easy to stop using. Ask for advice or help from a health professional.

Other drugs

It is recommended not to use drugs during pregnancy.

The effects of drugs on an unborn baby depend on a number of factors: the type of drugs used, the amount consumed, their potency, and the moment and way the drugs are taken.

What’s more, there is no way of knowing the exact composition of drugs sold on the black market. These drugs are sometimes cut with other substances that can increase the risks associated with their use.

Cocaine use during pregnancy, for example, can cause bleeding or placental detachment, which can, in turn, lead to the death of the fetus or premature birth. Babies whose mothers took drugs during pregnancy may develop drug withdrawal symptoms at birth.

If you have questions or concerns about your use of cannabis or other drugs or you need help to quit, talk to your health professional or contact:

Drugs, Help and Referral 
514-527-2626  
1-800-265-2626
aidedrogue.ca


Last updated:
17 February 2026