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? Or of driving under the influence of alcohol, marijuana (pot), and both at the same time?

Study: Influence of Alcohol, Marijuana, and Both

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.  It was over a period of 12 years. That survey is done by a federal agency (SAMSHA).

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.

influence of marijuana
Driving under influence of marijuana and alcohol at same time greatly increases risk of crash.

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

During the 12 years, the incidence of driving under the influence of alcohol, marijuana, and both generally dropped greatly.

The effects of alcohol and marijuana on driving skills is additive. Together, they have much greater effect than separately. This suggests the need for greater concern about reducing driving while under the influence of both at the same time.

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    • This site gives no advice. Please see your doctor with questions.