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

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

The West Kootenay Timberwolves received $1535 in relief funding. Photo: Submitted
Three Rossland sports groups receive provincial funding

28 sports groups across the Kootenay will be receiving money from the Local Sport Relief Fund

Kootenay Columbia Teachers’ Union president Andy Davidoff. Photo: Jennifer Small
An open letter to Premier Horgan and Minister Whiteside: Let’s stop harming our children during a pandemic

A letter from Andrew Davidoff, President Kootenay Columbia Teachers’ Union

Interior Health reported 79 new cases of COVID-19 and two new death in the region Friday, Jan. 22, 2021. (Ben Hohenstatt/Juneau Empire)
79 new COVID-19 cases, two deaths reported in Interior Health

Both of Friday’s deaths were both recorded at long-term care homes

Interior Health reported 91 new COVID-19 cases in the region Jan. 20, 2021 and three additional deaths. (Jennifer Smith - Morning Star)
95 new COVID-19 cases in Interior Health, two deaths

Another member of Vernon’s Noric House has passed

KBFR
Driver taken to hospital after hitting ditch near Genelle

Kootenay Boundary first responders attend single vehicle accident, RCMP investigate

U.S. Senator Bernie Sanders sits in on a COVID-19 briefing with Dr. Bonnie Henry, provincial health officer, and Adrian Dix, B.C. minister of health. (Birinder Narang/Twitter)
PHOTOS: Bernie Sanders visits B.C. landmarks through the magic of photo editing

Residents jump on viral trend of photoshopping U.S. senator into images

A 75-year-old aircraft has been languishing in a parking lot on the campus of the University of the Fraser Valley, but will soon be moved to the B.C. Aviation Museum. (Paul Henderson/ Chilliwack Progress)
Vintage military aircraft moving from Chilliwack to new home at B.C. Aviation Museum

The challenging move to Vancouver Island will be documented by Discovery Channel film crews

A video posted to social media by Chilliwack resident Rob Iezzi shows a teenager getting kicked in the face after being approached by three suspects on Friday, Jan. 22, 2021. (YouTube/Rob i)
VIDEO: Security cameras capture ‘just one more assault’ near B.C. high school

Third high-school related assault captured by Chilliwack resident’s cameras since beginning of 2021

FILE - In this Feb. 14, 2017, file photo, Oklahoma State Rep. Justin Humphrey prepares to speak at the State Capitol in Oklahoma City. A mythical, ape-like creature that has captured the imagination of adventurers for decades has now become the target of Rep. Justin Humphrey. Humphrey, a Republican House member has introduced a bill that would create a Bigfoot hunting season, He says issuing a state hunting license and tag could help boost tourism. (Steve Gooch/The Oklahoman via AP, File)
Oklahoma lawmaker proposes ‘Bigfoot’ hunting season

A Republican House member has introduced a bill that would create a Bigfoot hunting season

Economic Development and Official Languages Minister Melanie Joly responds to a question in the House of Commons Monday November 23, 2020 in Ottawa. THE CANADIAN PRESS/Adrian Wyld
Federal minister touts need for new B.C. economic development agency

Last December’s federal economic update promised a stimulus package of about $100 billion this year

FILE - In this Nov. 20, 2017, file photo, Larry King attends the 45th International Emmy Awards at the New York Hilton, in New York. Former CNN talk show host King has been hospitalized with COVID-19 for more than a week, the news channel reported Saturday, Jan. 2, 2021. CNN reported the 87-year-old King contracted the coronavirus and was undergoing treatment at Cedars-Sinai Medical Center in Los Angeles. (Photo by Andy Kropa/Invision/AP, File)
Larry King, broadcasting giant for half-century, dies at 87

King conducted an estimated 50,000 on-air interviews

BC Coroners Service is currently investigating a death at Canoe Cove Marina and Boatyard in North Saanich. (Black Press Media File)
Drowning death in North Saanich likely B.C.’s first in for 2021

Investigation into suspected drowning Monday night continues

Kimberly Proctor, 18, was murdered in 2010. Her family has spent many of the years since pushing for a law in her honour, that they say would help to prevent similar tragedies. (Courtesy of Jo-Anne Landolt)
Proposed law honouring murdered B.C. teen at a standstill, lacks government support

Ministry of Mental Health and Addictions has concerns with involuntary detainment portion of act

Sunnybank in Oliver. (Google Maps)
Sunnybank long-term care in Oliver reports third COVID-19 death

The facility currently has an outbreak with 35 cases attached to it

Most Read