Name: Weed gummies impair driving and increase crashes, study shows
Uploaded: 2026-01-14T19:49:18.463Z
Duration: 2 min 13 s
Description: The Driving Research and Simulation Laboratory at the University of Saskatchewan in Saskatoon gave cannabis edibles to 50 drivers and tested their driving skills and decision-making. Nearly half crashed within the first three hours.

The Driving Research and Simulation Laboratory at the University of Saskatchewan in Saskatoon gave cannabis edibles to 50 drivers and tested their driving skills and decision-making. Nearly half crashed within the first three hours.

Saskatoon

A study conducted at the University of Saskatchewan's Driving Research and Simulation Laboratory has found that edible cannabis, specifically weed gummies containing 10 milligrams of THC, significantly impairs the driving abilities of young adults aged 19 to 30. The experiment involved 50 participants who were tested on various driving skills in a simulator, revealing a marked decline in cognitive function and an increase in crash rates over time after consumption.

Results showed that 30% of participants crashed within 1.5 hours of consuming the gummy, rising to 44% at 2.5 hours and 58% at four hours. The study, funded by the Canadian Automobile Association, also noted that most participants were aware of their impairment, with 96% reporting they could not drive safely at 1.5 hours post-consumption. The findings have been submitted for peer review, and further research is planned to assess chronic cannabis users.

Weed gummies impair driving and increase crashes, study shows

The results are in. Edible cannabis impairs young drivers. Maybe not surprising, but there's been little evidence to prove it until now. Last year, an experiment at the University of Saskatchewan's Driving Research and Simulation Laboratory set out to test high drivers. 50 people aged 19 to 30 ate a weed gummy with 10 milligrams of THC and were strapped into the lab's driving simulator. Then they were tested for driving skills from reaction time to speed control to lane changes. It was in the population of younger drivers who tend to have more risk-taking behaviours and sometimes feeling like they can't get an accident and being invincible. The study examined when the driver's abilities are most compromised. The results indicate a significant drop in cognitive ability right after consuming a weed gummy. After an hour and a half, 30% of drivers were involved in a crash. At two and a half hours, that jumps to 44%, and by the four-hour mark, 58% of the drivers crash. We saw actually even just crashes on a single highway, just not being able to maintain the lane and crashing right into a truck. So sometimes we don't even need a prompt to see the accident. It's just their ability to handle the vehicle that's impaired. The Canadian Automobile Association funded the study. Its research shows edibles are more popular than ever, especially among youth. In a news release, it calls that concerning due to the delayed onset of effects, which could catch users off guard. We found that they were actually quite aware that they could not drive, and 96%, for example, reported that they could not drive safely at 1.5 hours. So that is actually a good thing. We're quite happy to see that, because if they're aware they can't drive, they're probably less likely to do it. The study has been submitted for peer review. Krizzle says next up, the lab wants to look at the driving performance of chronic cannabis consumers. Jeremy Warren, CBC News, Saskatoon.

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