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Effect of Recreational Cannabis Sales on Traffic Fatalities

by Colleen Fleiss on February 6, 2019 at 1:27 AM
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Effect of Recreational Cannabis Sales on Traffic Fatalities

A new study has found that traffic fatalities are on a high after cannabis legalisation. Monash University research examined the effect of recreational cannabis sales (RCS) on traffic fatalities in three US states where it was legalised - Colorado (legalised 2014), Washington (2014), and Oregon (2015), and nine neighbouring jurisdictions from 2009-2016.

The researchers looked at the number of additional deaths each month after legalisation, and found there was on average one additional traffic fatality per million residents, in comparison to states that had not changed cannabis laws. The increase was temporary, seeming to last for about a year following legalisation. The combined population of affected areas is 27 million people, suggesting an additional 170 deaths in the first six months after legalisation.

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But the study reported the spill over effects to be slightly larger in neighbouring states and provinces, particularly those with population centres closest to the border of a legalising state - possibly because cannabis users were driving interstate to make purchases, before returning under the influence.

It's called 'cannabis tourism', and Monash University's Dr Tyler Lane says there are important implications for both legalising states and their neighbours as prohibitions against cannabis use are lifted globally.
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"The effect of cannabis legalisation on traffic fatalities is a growing public health concern," Dr Lane said.

"The results suggest that legalising the sale of cannabis for recreational use can lead to a temporary increase in traffic fatalities in legalising states. This spills over into neighbouring jurisdictions through cross-border sales, trafficking, or cannabis tourists driving back to their state of residence while impaired.

Dr Lane said the findings were in contrast to research on medicinal cannabis suggesting it decreases traffic fatalities.

One reason for the difference may be that medicinal users tend to substitute cannabis for other substances, including alcohol, which has a greater effect on impairment. Recreational users are less likely to substitute and more likely to combine alcohol and cannabis, which has a much bigger effect than either in isolation.

Source: Eurekalert
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