Cannabis and work

With the legalization of recreational marijuana in Canada, workplaces are concerned about its implications for workplace health, safety and productivity. IWH researchers are watching the research literature and conducting their own studies in order to help answer questions about marijuana use at work: its scope, its effects, and its relationship to work-related injuries and deaths.

Featured

A jar of cannabis buds on a brown desk
At Work article

Cannabis use linked to higher injury risk, but only among those who use at or before work

Does the use of cannabis increase a worker’s risk of having a workplace injury? Previous studies have found mixed results, but none has looked specifically at the use of cannabis just before or at work.
Published: April 12, 2022
A pair of hands roll a cannabis joint
At Work article

At-work cannabis use linked to work factors, including some not expected: IWH study

What factors differentiate people who use cannabis at work from those who don't? An IWH study finds they all relate to people's job characteristics and environments, including some that are surprising.
Published: February 25, 2021
A jar of cannabis buds on a brown desk
At Work article

Cannabis use linked to higher injury risk, but only among those who use at or before work

Does the use of cannabis increase a worker’s risk of having a workplace injury? Previous studies have found mixed results, but none has looked specifically at the use of cannabis just before or at work.
Published: April 2022
IWH Speaker Series
IWH Speaker Series

Cannabis use and the risk of workplace injury: Findings from a longitudinal study of Canadian workers

Does the use of cannabis increase a worker’s risk of having a workplace injury? Prior studies examining this issue have yielded mixed findings and have had some important methodological shortcomings. In this presentation, Dr. Nancy Carnide shares new findings from a longitudinal study of Canadian workers looking at the relationship between cannabis use and workplace injury—including workplace use.
Published: March 2022
NSC Safety + Health
IWH in the media

Supervisors and people in safety-sensitive jobs using cannabis at work, researchers find

Workers who reported using cannabis before or during a shift – including supervisors and people in safety-sensitive jobs – had jobs and work environments in which detection was less likely, according to the results of a recent study out of Canada.
Published: Safety + Health, April 2021
A pair of hands roll a cannabis joint
At Work article

At-work cannabis use linked to work factors, including some not expected: IWH study

What factors differentiate people who use cannabis at work from those who don't? An IWH study finds they all relate to people's job characteristics and environments, including some that are surprising.
Published: February 2021
Project
Project

Ontario Life After Work Injury Study: Cannabis use and long-term recovery and return-to-work outcomes among Ontario injured workers

An IWH study is helping us understand how workers with work-related injuries and illnesses use cannabis and how that use is related to their recovery and return to work.
Status: Ongoing
Infographic
Infographic

Cannabis use and the Canadian workplace (2020)

From 2018 to 2021, the Institute for Work & Health is conducting a yearly survey of Canadian workers about cannabis. The aim is to understand how the legalization of non-medical cannabis is affecting workers’ cannabis use and beliefs about use. This infographic highlights some of what we learned in our first comparison of pre- and post-legalization findings, based on the first and second surveys.
Published: October 2020
Canadian HR Reporter logo
IWH in the media

Is cannabis use on the rise?

Conflicting numbers suggest overall consumption is up, but at-work use unchanged, John Dujay reports on findings of a Institute for Work & Health study led by IWH Associate Scientist Dr. Nancy Carnide.
Published: Canadian HR Reporter, June 2020
A close-up of a man's hand, holding a joint
At Work article

At-work use of cannabis reported by 1 in 12 workers—no change since legalization

In follow-up study of cannabis use before and after legalization in Canada, IWH research team found no increase in at-work or daily use of cannabis. Still, one in 12 said they used cannabis just before work, during work or during work breaks.
Published: April 2020
Daily Commercial News logo
IWH in the media

Where does the use of cannabis now stand in the eyes of the workplace?

Has cannabis use and perception about workplace cannabis use changed since legalization? That’s the question Dr. Nancy Carnide and a team at the Institute for Work and Health (IWH) is exploring through annual surveys of Canadian workers. Angela Gismondi reports on the preliminary results, which Carnide shared at the Ontario General Contractors Association (OGCA) and Infrastructure Health and Safety Association (IHSA) Leadership Day.
Published: Daily Commercial News, March 2020