New Study Shows Traffic Fatalities Decline In States Where Cannabis Is Legal

States with medical cannabis laws have fewer traffic fatalities than those without, especially among younger drivers, a new study has found.

Using data from the 1985–2014 Fatality Analysis Reporting System, researchers “examined the association between MMLs [medical marijuana laws] and traffic fatalities in multilevel regression models while controlling for contemporaneous secular trends.” They examined this association “separately for each state enacting MMLs”, and also “evaluated the association between marijuana dispensaries and traffic fatalities.”

The study found that; “On average, MML states had lower traffic fatality rates than non-MML states. Medical marijuana laws were associated with immediate reductions in traffic fatalities in those aged 15 to 24 and 25 to 44 years, and with additional yearly gradual reductions in those aged 25 to 44 years.”

Researchers note that “state-specific results showed that only 7 states experienced post-MML reductions”, and “Dispensaries were also associated with traffic fatality reductions in those aged 25 to 44 years.”

The study also concluded that; “Both MMLs and dispensaries were associated with reductions in traffic fatalities, especially among those aged 25 to 44 years. State-specific analysis showed heterogeneity of the MML–traffic fatalities association, suggesting moderation by other local factors. These findings could influence policy decisions on the enactment or repealing of MMLs and how they are implemented.”

According to Silvia Martins, a professor who served as the study’s lead author, the decrease is likely associated with a decrease in alcohol consumption.

“We found evidence that states with the marijuana laws in place compared with those which did not, reported, on average, lower rates of drivers endorsing driving after having too many drinks,” Martins said in a press release.

“This study is about the possible substitution relationship between marijuana and opioids. The toxicological testing data for fatally injured drivers…supports the substitution hypothesis in young adults, but not in older adults,” Columbia professor of epidemiology Dr. Guohua Li, the study’s senior author, said in a statement.

The study was conducted at Columbia University’s Mailman School of Public Health; it can be found by clicking here.

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Author: m00nrock

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