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Marijuana Use Has “Little” Impact on Driving Performance


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Driving Stoned

According to data in the journal Drug and Alcohol Dependence, persons who consumed marijuana typically decrease their driving speed but showed few other significant changes in driving performance.

Canadian researchers evaluated the simulated driving performance of young adult subjects who had smoked a product containing high-THC, low-THC, or placebo (no THC), NORML reported. The subjects’ driving performance was analyzed 30 minutes after smoking, 24 hours and 48 hours.

“Among young regular but non-dependent cannabis users, smoked cannabis led to a significant reduction in driving speed, …but there was little evidence of residual effects,” the researchers stated.

Other studies have found similar results which suggest that cannabis consumption only slightly effects driving performance.


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Arizona legalized marijuana for recreational use in November 2020. The law allows adults aged 21+ to purchase, possess and use cannabis. State-licensed cannabis dispensaries began selling recreational marijuana in early 2021. There are over 150 dispensaries in Arizona — a majority of them are in populous areas such as Phoenix, Tucson and Flagstaff. Recreational cannabis delivery services began operating in 2024.  


AZ Cannabis Updates