How cannabis legalization affects substance use
The legalization of cannabis affects substance use, with the potential for both negative and positive effects on public health, a new McGill-led study found.
A McGill-led study has found that the legalization of cannabis can have both negative and positive impacts on public health, affecting substance use in various ways. The researchers conducted a comprehensive review of evidence from 176 studies spanning 30 years in multiple countries. The findings, published in The Milbank Quarterly, shed light on the ripple effects of cannabis policy reforms on substance use and public health.
The study revealed that cannabis legalization has led to an increase in adult cannabis use, as well as an uptick in emergency department visits and poison center reports related to cannabis. However, the effects on youth were less pronounced. Medical cannabis legalization may have the potential to reduce alcohol use among both youths and adults, while recreational legalization has shown a more complex picture, particularly among young adults.
Alcohol use patterns varied depending on the policy and population studied. Medical cannabis legalization might reduce alcohol consumption in some cases, while recreational legalization could lead to an increase in alcohol use and binge drinking among young adults. Tobacco use, on the other hand, generally remained stable or declined after cannabis legalization.
Interestingly, most studies found no increase in opioid use following cannabis legalization, with some even indicating decreases in opioid prescribing, sales, and related health care visits. However, the research highlights a gap in knowledge regarding the effects of cannabis decriminalization or legalization on the use of other illicit drugs, suggesting that future research should focus on this area.
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