Substantial scientific evidence from meta-analyses, simulator trials, and epidemiological studies indicates that acute marijuana consumption impairs driving performance and increases motor vehicle collision risk, although some recent emergency department studies report mixed findings.
Evidence for · 7
The effects of cannabis intoxication on motor vehicle collision revisited and revised
2016 · cited by 277
This meta-analysis found that acute cannabis intoxication is associated with a statistically significant increase in motor vehicle crash risk.
Evidence against · 1
Risk of motor vehicle collision associated with cannabis and alcohol use among patients presenting for emergency care.
2024 · cited by 0
This emergency department study found that cannabis alone was not associated with higher odds of motor vehicle collisions, presenting conflicting results compared to broader epidemiological work.
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More for · 6
Real-World Driving Behavior, Performance, and Risk Following Alcohol and Cannabis Use in Habitual Cannabis Users
2026 · cited by 0
Naturalistic driving data indicated that cannabis-positive trips demonstrated behavioral differences and potential lane-tracking difficulties.
The effects of cannabis and alcohol on driving performance and driver behaviour: a systematic review and meta-analysis.
2022 · cited by 0
This systematic review and meta-analysis concluded that cannabis impairs driving performance, particularly affecting lateral control.
Determining the magnitude and duration of acute Δ9-tetrahydrocannabinol (Δ9-THC)-induced driving and cognitive impairment: A systematic and meta-analytic review.
2021 · cited by 0
This review established that acute THC intoxication causes measurable impairments in driving performance and driving-related cognitive skills.
Driving under the influence of cannabis: links with dangerous driving, psychological predictors, and accident involvement.
2009 · cited by 0
The study found that acute cannabis intoxication diminishes driving faculties and is associated with an elevated risk of collision.
Cannabis use: a perspective in relation to the proposed UK drug-driving legislation.
2014 · cited by 0
This paper reported a significant dose-related decrement in driving performance following cannabis use alongside an increased crash risk.
Adverse effects of cannabis on health: an update of the literature since 1996.
2004 · cited by 0
This literature update noted that a causal role of acute cannabis intoxication in motor accidents has been demonstrated by THC presence and higher culpability risks.