In a nationally representative Canadian survey after legalization, 4.7% of past-year cannabis users scored at or above the threshold for impaired control, with higher risk among males, 18-24 year olds, lower-income households, those with mood/anxiety disorders, and those who started using before age 16.
Public health officials, cannabis policy researchers, addiction clinicians, prevention program designers.
4.7% of Canadian cannabis users showed signs of impaired control after legalization
What the researchers found
4.7% of past-year cannabis consumers had Severity of Dependence Scale scores of 4 or higher (impaired control). Risk was elevated for males, ages 18-24, single/never married, lower-income households, those diagnosed with anxiety or mood disorders, those who started cannabis before age 16, and those consuming at least monthly.
Why it matters
This is among the first nationally representative assessments of problematic cannabis use in Canada after legalization. The 4.7% rate provides a baseline for monitoring whether legalization changes patterns of problematic use over time.
The numbers in context
4.7% of past-year consumers had impaired control (SDS >= 4). Risk elevated for: males, ages 18-24, single, lower income, anxiety/mood disorder diagnosis, cannabis initiation at age 15 or younger, at least monthly use.
How the study worked
Cross-sectional analysis of the nationally representative 2019-2020 Canadian Community Health Survey using the Severity of Dependence Scale (SDS). Multivariable logistic regression examined associations with impaired control.
What this study cannot tell us
Cross-sectional design captures a snapshot, not trajectories. SDS is a screening tool, not a clinical diagnosis of CUD. Self-reported cannabis use may underestimate true use. Post-legalization data may still reflect transition effects rather than steady-state patterns.
How to read the evidence
Nationally representative survey data from the Canadian Community Health Survey with multivariable adjustment.
When this study was published
Published in 2023 using 2019-2020 data.
The bigger picture
Knowing that roughly 1 in 20 cannabis users shows signs of impaired control helps calibrate the public health response. The risk factors identified here (young, male, early initiation, mental health conditions) can guide targeted prevention.
Questions still open
- Will the rate of impaired control change as the legal market matures?
- Would early intervention targeting the identified risk groups prevent progression to cannabis use disorder?
Common questions
How many cannabis users have trouble controlling their use?
Who is most at risk for problematic cannabis use?
Read the original research
Using the Severity of Dependence Scale to examine cannabis consumers with impaired control in Canada.
Health reports, 34(6), 3-16
Citation
Rotermann, Michelle. (2023). Using the Severity of Dependence Scale to examine cannabis consumers with impaired control in Canada.. Health reports, 34(6), 3-16. https://doi.org/10.25318/82-003-x202300600001-eng
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