(HealthDay News) – Drivers under the influence of cannabis are twice as likely to be involved in motor vehicle collisions, particularly fatal collisions, according to research published online Feb. 9 in BMJ.
Mark Asbridge, PhD, of Dalhousie University in Halifax, Canada, and colleagues conducted a systematic review of 19 databases to identify nine observational epidemiology studies and one meta-analysis in an effort to determine whether a driver’s acute consumption of cannabis increased the risk of a motor vehicle collision.
The researchers found that drivers who were under the influence of cannabis were nearly twice as likely to be involved in a motor vehicle collision compared with drivers who were unimpaired. In case-control studies, drivers were found to be 2.79 times as likely to be involved in a collision. In studies of fatal collisions, acute cannabis consumption by the driver resulted in a 2.1-fold higher risk of collision.
“After a systematic review of the literature, this meta-analysis of studies examining acute cannabis consumption and motor vehicle collisions, with adequate control groups, found a near doubling of risk of a driver being involved in a motor vehicle collision resulting in serious injury or death,” the authors write.