Driving Under the Influence of Marijuana, Alcohol, and Both

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

Study

To find out, researchers studied self-reports of drivers age 16 to 25. The data came from the National Survey on Drug Use and Health. The period was 12 years. That survey is conducted by a federal agency, SAMHSA.

Results

The incidence of driving impaired by alcohol alone dropped 59%. That was among those age 16-20. It fell 38% among those age 21-25.

Driving impaired by both alcohol and pot dropped 39% among those age 16-20. It declined 52% among those age 21-25.

The prevalence of driving under the influence of pot alone fell 18%. But only among drivers age 16-20.

Driving Under the Influence of Marijuana, Alcohol, and Both.

Summary

Over 12 years, the incidence of driving under the influence of pot, alcohol and both generally dropped greatly. See figures 1 and 2. For larger views, click on images.

driving under the influence
Fig. 1. Percentage who reported driving impaired by 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 impaired by alcohol alone, marijuana alone, and alcohol and marijuana combined in the previous year by age.

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