Driving Under the Influence of Marijuana, Alcohol, and Both

How common is driving under the influence of marijuana? Of driving under the influence of alcohol? Of driving under the influence of both at the same time?

Study

To find out, self-reports of drivers age 16 to 25 were analyzed. The data came from the National Survey on Drug Use and Health from 2002 through 2014. That survey is conducted by the U.S. Substance Abuse and Mental Health Services Administration (SAMSHA).

Results

The incidence of driving under the influence of alcohol alone dropped 59% among those age 16-20. It fell 38% among those age 21-25.

Driving under the influence of both alcohol and marijuana dropped 39% among those age 16-20. It declined 52% among those age 21-25.

The prevalence of driving under the influence of marijuana alone fell 18%, but only among drivers age 16-20.

Summary

Between 2002 and 2014, the incidence of driving under the influence of marijuana, alcohol and both generally dropped greatly. See figures 1 and 2. For larger views, click on images.

ng under the influence of marijuana

Fig. 1. Percentage who reported driving under the influence of alcohol alone, marijuana alone, and alcohol and marijuana combined in the previous year among drivers aged 16’“20 and 21’“25.

 

driving under the influence of marijuana

Fig. 2. Percentage who reported driving under the influence of alcohol alone, marijuana alone, and alcohol and marijuana combined in the previous year by age.

 

Source:  Azofeifa, A., et al. Driving under the influence of alcohol, marijuana, and alcohol and marijuana combined among persons aged 16’“25 Years ‘” United States, 2002’“2014. Morbidity and Mortality Weekly Report, Dec. 11, 2015, 64(48), 1325-9.

Learn more about driving under the influence of marijuana, alcohol, and both

Bedard, M., et al. The impact of cannabis on driving.  Canad J Pub Health, 2007, 98(1),  6-11.

Berning, A., et al. Results of the 2013’“2014 National Roadside Survey of Alcohol and Drug Use by Drivers. Report No. DOT HS 812 118. Washington, DC: US DOT, NHTSA, 2015.

Hanson, D. Effects of Substances on Driving. In: Miller, P. (Ed.) Principles of Addiction. Amsterdam: Elsevier, 2013.

Hartman, R., et al. Cannabis effects on driving lateral control with and without alcohol. Drug Alco Depend, 2015, 154, 25’“37.

Hartman, R., Huestis, M. Cannabis effects on driving skills. Clin Chem, 2013, 59, 478’“492.

Lenna, M., et al.  Effects of cannabis and alcohol on driving. Accid Anal Prev, 2010, 42, 859’“866.

Ramaekers, J., et al. Marijuana, alcohol and actual driving performance.  Hum. Psychopharm. Clin. Exp., 2000, 15, 551-558.

Schwilke, E., et al.  Changing patterns of drug and alcohol use in fatally injured drivers.  J Foren Sci, 2006, 51(5),   1191’“1198.

Sewell, R.A., et al. The effect of cannabis compared with alcohol on driving. Am J Addict, 2009, 18, 185’“93.