Both habitual and casual cannabis users had higher odds of traffic violations compared to non-users
Among 5,630 Canadian emerging adults, both habitual (OR=1.77) and casual (OR=1.79) cannabis users had significantly higher odds of past-year traffic violations, with age and other drug use moderating the relationship.
Quick Facts
What This Study Found
Both habitual (OR=1.77) and casual (OR=1.79) cannabis users had higher odds of traffic violations than non-users. Early emerging adults (15-19) who were casual users and middle emerging adults (20-24) who were habitual or casual users showed higher odds. The association was stronger in the absence of other drug use.
Key Numbers
5,630 respondents; habitual cannabis OR=1.77; casual cannabis OR=1.79; male prevalence 19.2% vs female 9.9%; violations higher in middle (16.2%) and late (19.4%) vs early (8.8%) EAs
How They Did This
Cross-sectional analysis of 5,630 respondents from the 2012 Canadian Community Health Survey-Mental Health, categorized as early (15-19), middle (20-24), and late (25-29) emerging adults.
Why This Research Matters
The finding that casual cannabis use carries similar traffic violation risk as habitual use challenges the assumption that only heavy users are at risk, suggesting even occasional use may affect driving-related outcomes.
The Bigger Picture
This population-level data complements simulator studies by showing that cannabis use is associated with real-world driving outcomes, not just laboratory measures of impairment.
What This Study Doesn't Tell Us
Cross-sectional self-reported data. Traffic violations include many types beyond impaired driving. Cannot establish that cannabis caused the violations. 2012 data predates legalization.
Questions This Raises
- ?Are these traffic violations directly related to cannabis impairment or to broader risk-taking behavior?
- ?Has legalization changed the association between cannabis use and traffic violations?
Trust & Context
- Key Stat:
- Both habitual and casual cannabis use linked to ~1.8x higher odds of traffic violations
- Evidence Grade:
- Large national health survey with multivariate analysis but cross-sectional design
- Study Age:
- Published in 2021 using 2012 pre-legalization Canadian data.
- Original Title:
- Steering clear: Traffic violations among emerging adults who engage in habitual or casual cannabis use.
- Published In:
- Accident; analysis and prevention, 153, 106059 (2021)
- Authors:
- Ciccarelli, Tiana M, Leatherdale, Scott T(10), Perlman, Chris, Thompson, Kara, Ferro, Mark A
- Database ID:
- RTHC-03064
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Does cannabis use increase traffic violations?
In this Canadian study, both habitual and casual cannabis users had about 1.8 times higher odds of past-year traffic violations compared to non-users, even after controlling for other factors.
Are casual cannabis users also at risk?
Yes. Casual cannabis users had similar odds of traffic violations (1.79x) as habitual users (1.77x), challenging the assumption that only heavy users face driving-related risks.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-03064APA
Ciccarelli, Tiana M; Leatherdale, Scott T; Perlman, Chris; Thompson, Kara; Ferro, Mark A. (2021). Steering clear: Traffic violations among emerging adults who engage in habitual or casual cannabis use.. Accident; analysis and prevention, 153, 106059. https://doi.org/10.1016/j.aap.2021.106059
MLA
Ciccarelli, Tiana M, et al. "Steering clear: Traffic violations among emerging adults who engage in habitual or casual cannabis use.." Accident; analysis and prevention, 2021. https://doi.org/10.1016/j.aap.2021.106059
RethinkTHC
RethinkTHC Research Database. "Steering clear: Traffic violations among emerging adults who..." RTHC-03064. Retrieved from https://rethinkthc.com/research/ciccarelli-2021-steering-clear-traffic-violations
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.