ArticleJournal of studies on alcohol and drugs2022
Changes in Traffic Crash Rates After Legalization of Marijuana: Results by Crash Severity.
Article in Journal of studies on alcohol and drugs, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers, 2 of them syntheses 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
17 citing papers in PubMed, 2 syntheses or guidelines pooled it, 31 citations in OpenAlex.
- Road hazard: a systematic review of traffic injuries following recreational cannabis legalization.CJEM · 2024Pooled it
- The clouded debate: A systematic review of comparative longitudinal studies examining the impact of recreational cannabis legalization on key public health outcomes.Frontiers in psychiatry · 2022Pooled it
- Article
- Short-term residual effects of smoked cannabis on simulated driving performance.Psychopharmacology · 2026Article
- Longitudinal, population-based analysis of burn injuries across Canada pre-recreational and post-recreational cannabis legalisation.BMJ public health · 2026Article
- Article
- Noncompliance with laws to prevent polysubstance misuse: Recreational cannabis sales to apparently alcohol-intoxicated customers.Alcohol, clinical & experimental research · 2026Article
- Impact of naturalistic cannabis use on lateral control and speed: A driving simulator study.Traffic injury prevention · 2025Article
- Driving and cannabis use: a questionnaire about knowledge and behaviors after the legalization of recreational cannabis in California.BMC public health · 2025Article
- [Cannabis and adolescents in Spain: use and consequences. State of play].Revista espanola de salud publica · 2025Observational
- Cannabis retail store density and county-level mortality from injury in the state of Washington from 2009-2020.The American journal of drug and alcohol abuse · 2025Article
- Drug use among individuals injured in non-fatal motor vehicle crashes and related policies in 2023.Traffic injury prevention · 2025Article
- Special Report from the CDC: Driving under the influence of alcohol, marijuana, or other illicit drugs among drivers aged ≥16 years - National Survey on Drug Use and Health, 2016-2019.Journal of safety research · 2024Article
- State cannabis laws and cannabis positivity among fatally injured drivers.Injury epidemiology · 2024Article
- Cannabis Use Frequency and Cannabis-Related Consequences in High-Risk Young Adults Across Cannabis Legalization.JAMA network open · 2023Observational
- Regulation of Cannabis Retailers: Facilitating Responsible Adult Use and Promoting Health Equity While Preventing Access to Minors.American journal of public health · 2022Article
- A study of self-reported personal cannabis use and state legal status and associations with engagement in and perceptions of cannabis-impaired driving.Traffic injury prevention · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveThe objective of this study was to estimate the effects of marijuana legalization and the subsequent onset of retail sales on injury and fatal traffic crash rates in the United States during the period 2009-2019.
methodState-by-state quarterly crash rates per mile of travel were modeled as a function of time, unemployment rate, maximum posted speed limit, seat belt use rate, alcohol use rate, percent of miles driven on rural roads, and indicators of legalized recreational marijuana use and sales.
resultsLegalization of the recreational use of marijuana was associated with a 6.5% increase in injury crash rates and a 2.3% increase in fatal crash rates, but the subsequent onset of retail marijuana sales did not elicit additional substantial changes. Thus, the combined effect of legalization and retail sales was a 5.8% increase in injury crash rates and a 4.1% increase in fatal crash rates. Across states, the effects on injury crash rates ranged from a 7% decrease to an 18% increase. The effects on fatal crash rates ranged from a 10% decrease to a 4% increase.
conclusionsThe estimated increases in injury and fatal crash rates after recreational marijuana legalization are consistent with earlier studies, but the effects varied across states. Because this is an early look at the time trends, researchers and policymakers need to continue monitoring the data.
Indexed as
Identifiers
35838426PMC9318699W4285600379What 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.