ArticleInternational journal of public health2014
Cannabis and traffic collision risk: findings from a case-crossover study of injured drivers presenting to emergency departments.
Article in International journal of public health, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
27 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Cannabis Use and Car Crashes: A Review.Frontiers in psychiatry · 2021Pooled it
- Can inhaled cannabis users accurately evaluate impaired driving ability? A randomized controlled trial.Frontiers in public health · 2023Trial
- Event-level influences of alcohol, cannabis, and simultaneous use on perceived driving risk.Experimental and clinical psychopharmacology · 2025Article
- Driving under the influence of drugs: Correlation between blood psychoactive drug concentrations and cognitive impairment. A narrative review taking into account forensic issues.Forensic science international. Synergy · 2022Review
- Preliminary Eye-Tracking Data as a Nonintrusive Marker for Blood Δ-9-Tetrahydrocannabinol Concentration and Drugged Driving.Cannabis and cannabinoid research · 2021Article
- Early, Chronic, and Acute Cannabis Exposure and Their Relationship With Cognitive and Behavioral Harms.Frontiers in psychiatry · 2021Article
- Driving Under the Influence of Cannabis in Canada, 2015 to 2018.Canadian journal of psychiatry. Revue canadienne de psychiatrie · 2020Article
- Article
- Cannabis in the workplace: What physicians need to know.Canadian family physician Medecin de famille canadien · 2020Article
- Recreational cannabis use impairs driving performance in the absence of acute intoxication.Drug and alcohol dependence · 2020Article
- Marijuana and alcohol use among injured drivers evaluated at level I trauma centers in Arizona, 2008-2014.Drug and alcohol dependence · 2019Article
- The impact of recreational marijuana commercialization on traumatic injury.Injury epidemiology · 2019Article
- Alcohol and marijuana use among young injured drivers in Arizona, 2008-2014.Traffic injury prevention · 2019Article
- Impacts of Marijuana Commercialization on Adolescents' Marijuana Beliefs, Use, and Co-use With Other Substances.The Journal of adolescent health : official publication of the Society for Adolescent Medicine · 2018Article
- Does Starting to Smoke Cigars Trigger Onset of Cannabis Blunt Smoking?Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco · 2018Article
- The Association of Unfavorable Traffic Events and Cannabis Usage: A Meta-Analysis.Frontiers in pharmacology · 2018Article
- Corrigendum: The Association of Unfavorable Traffic Events and Cannabis Usage: A Meta-Analysis.Frontiers in pharmacology · 2018Article
- Lower-Risk Cannabis Use Guidelines: A Comprehensive Update of Evidence and Recommendations.American journal of public health · 2017Review
- Cannabinoid disposition in oral fluid after controlled smoked, vaporized, and oral cannabis administration.Drug testing and analysis · 2017Article
- Medical Marijuana Legalization and Marijuana Use Among Youth in Oregon.The journal of primary prevention · 2017Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
8 authors.
Funding
Abstract
objectivesThis study examined whether acute cannabis use leads to an increased collision risk.
methodsParticipants were 860 drivers presenting to emergency departments in Toronto and Halifax, Canada, with an injury from a traffic collision, between April 2009 and July 2011. Cannabis and other drug use were identified either through blood sample or self-report. A case-crossover design was employed with two control conditions: a fixed condition measuring substance use during last time driving, and whether the driver typically uses cannabis prior to driving. Collision risk was assessed through conditional fixed-effects logistic regression models.
resultsResults revealed that 98 (11 %; 95 % CI: 9.0-13.1) drivers reported using cannabis prior to the collision. Regression results measuring exposure with blood and self-report data indicated that cannabis use alone was associated with a fourfold increased (OR 4.11; 95 % CI: 1.98-8.52) odds of a collision; a regression relying on self-report measures only found no significant association.
conclusionsMain findings confirmed that cannabis use increases collision risk and reinforces existing policy and educational efforts, in many high-income countries, aimed at reducing driving under the influence of cannabis.
Indexed as
Identifiers
24061594What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.