The published evidence suggests that marijuana use may impair motor performance. In a recent review, Ramaekers and colleagues (80) report that both epidemio-
logical and experimental studies show that marijuana use is associated with motor accidents. Further, they state that combined use of THC and alcohol produced severe impairment of cognitive, psychomotor, and actual driving performance in experimental studies and sharply increased the crash risk in epidemiological analyses. Significantly increased rates of motor vehicle injuries resulting in hospitalization have also been reported among marijuana users (81). Despite many reports in the published literature, the incidence and prevalence of accidents causally related to marijuana use are not known. More research is needed to establish a causal association between marijuana use and traffic accidents.
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