Nearly 5% of US adults reported driving under the influence of marijuana in 2018, according to a CDC report.
As a growing number of states legalize marijuana, concerns about a potential increase in impaired driving have emerged. As of January 2020, recreational marijuana was legal in 11 states and medical marijuana was legal in 33 states. Using marijuana has been associated with impaired psychomotor and cognitive function while driving and some evidence suggests an increased risk of crashes. A 2014 survey by the US Substance Abuse and Mental Health Services Administration found that about 3.2% of US residents aged 16 to 25 years reported driving under the influence of marijuana.
Kuehn B. Dangers of Driving While High. JAMA. 2020;323(6):500. doi:10.1001/jama.2020.0073
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