Out of the 20 states with the highest driver acknowledgement of drugged driving, 15 of the 20 were states that have passed legislation to allow the use of medical marijuana.
25% of all drug related fatal vehicle accidents in the US involve marijuana.
Marijuana is the second leading substance for which people receive drug abuse treatment.
The potency of marijuana has tripled over the past 20 years.
National Impaired Driving Prevention Month graphics for social media: