Between the years 2002 through 2014, the reported prevalence of marijuana and alcohol use prior to driving fell from 2.3 percent to 1.4 percent among those age 16 to 20 and from 3.1 percent to 1.9 percent among those age 21 to 25. Studies report that the use of the two substances combined is associated with additive adverse effects on various measurements of psychomotor performance.
Authors also reported that the prevalence of young people who acknowledge having driven under the influence of alcohol alone has fallen dramatically since 2002, while the percentage of young people reporting having operated a vehicle after consuming cannabis alone remained largely unchanged at roughly three percent.
Additional information on marijuana and psychomotor performance is available in the NORML report, “Cannabis and Driving: A Scientific and Rational Review,” online here: http://norml.org/library/driving-and-marijuana.
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