A handful of cannabis bud is shown in Fenwick, Ont., on Tuesday, June 26, 2018. THE CANADIAN PRESS/Tijana Martin

Researchers find cannabis use in pregnancy linked to greater risk of autism

Researchers caution findings only show association — not cause and effect

A new study links cannabis use in pregnancy to a greater risk of autism.

Researchers including experts from the Ottawa Hospital and the University of Ottawa reviewed data from every birth in Ontario between 2007 and 2012, before recreational cannabis was legalized.

They found 1.4 per cent of 18-month-olds were diagnosed with autism but that rate was higher among children exposed to cannabis in the womb, at 2.2 per cent.

RELATED: New study suggests autism overdiagnosed: Canadian expert

RELATED: Surf’s Up Tofino offers wave of positivity for families living with autism

Of roughly 500,000 women in the study, 3,000 reported cannabis use during pregnancy. The analysis focused on 2,200 women who said they only used cannabis during pregnancy, and no other substances.

Researchers don’t know how much cannabis was used, how often, at what stage of their pregnancy, or how it was consumed. They also caution the findings only show association — not cause and effect.

The findings were published today in the medical journal Nature Medicine.

Even though recreational cannabis is now legal and more socially acceptable, study co-author Dr. Darine El-Chaar says that doesn’t mean it’s safe for people who are pregnant or breastfeeding.

El-Chaar says cannabis use seems to be more prevalent, with her patients much more open about telling her it helps ease their morning sickness or pain.

“Our answer is still that we don’t have correct, properly made studies that are designed to look at this question,” says El-Chaar, a maternal-fetal medicine physician and clinician investigator at the Ottawa Hospital and assistant professor at the University of Ottawa.

Researchers had previously found that cannabis use in pregnancy was linked to an increased risk of preterm birth. That study also found pregnant women who used cannabis often used other substances including tobacco, alcohol and opioids.

Funding came from the Canadian Institutes of Health Research.

— By Cassandra Szklarski in Toronto

Get local stories you won't find anywhere else right to your inbox.
Sign up here

Just Posted

Nine new COVID-19 cases announced in Interior Health region

The total number of cases since the pandemic started is now at 531 for the region

BC VOTES 2020: Vernon nurse running for NDP

Harwinder Sandhu, who ran for NDP in 2019 federal vote, is declared Vernon-Monashee candidate

More victims possible in Vernon assault case

Police have a man in custody but feel there could be more victims in the case

North Okanagan Minor Lacrosse hosting skills camp

With social distancing rules in effect, camp runs Wednesdays through to Oct. 7 for all age groups

Okanagan community lifts up Indigenous food truck dream

BannockSlap Burgers and Indian Tacos opened for business on Labour Day weekend

Weekend sees 267 cases, 3 deaths in B.C.; Dr. Henry says events leading to COVID spread

There are currently 1,302 active cases in B.C., while 3,372 people are under public health monitoring

Motorcycle rider identified following fatal crash in Peachland

Michael Odenbach died in a motorcycle collision on Sept. 27

Liberals seek to fast track new COVID-19 aid bill after CERB expires

Government secured NDP support for legislation by hiking amount of benefits by $100 to $500 per week

B.C. VOTES 2020: Echoes of HST in B.C. debate over sales tax

Cannabis, tobacco, luxury cars still taxed in B.C. Liberal plan

Shuswap BC SPCA launches spay/neuter program for low-income residents

Program available to low-income residents in the region

Join Black Press Media and Do Some Good

Pay it Forward program supports local businesses in their community giving

She warned her son about toxic drugs, then he was dead

Donna Bridgman’s son died at the age of 38 in Vancouver

Known Kelowna Hells Angels associate to face trial in October

Colin Michael Bayley is set to stand trial next month for an alleged aggravated assault

Most Read