A comprehensive framework of 28 public health indicators across five themes was developed to evaluate Canada's cannabis regulation, with early data from other jurisdictions showing mixed results but some potential benefits.
Public health officials, policymakers, and researchers evaluating cannabis legalization outcomes.
28 indicators across 5 themes
What the researchers found
Twenty-eight indicators were identified under five themes: public safety, cannabis use trends, other substance use trends, cardiovascular/respiratory health, and mental health/cognition. Early data from US jurisdictions showed little consensus on harms but emerging evidence for benefits like reduced opioid use.
Why it matters
Canada's legalization is a natural experiment. Without agreed-upon metrics to track outcomes, it would be impossible to know whether the policy is working or where adjustments are needed.
The numbers in context
28 indicators identified across 5 broad themes. Preliminary data from legalized US jurisdictions referenced for each indicator where available.
How the study worked
Systematic search of five scientific databases to compile cannabis-related public health and safety indicators, supplemented with preliminary evidence from US states and Canadian provinces that had already legalized.
What this study cannot tell us
Framework is proposed rather than validated. Preliminary evidence from other jurisdictions may not translate to Canada. Many indicators lack reliable baseline data.
How to read the evidence
Moderate: systematic development of evaluation framework with preliminary supporting evidence.
When this study was published
Published in 2019.
The bigger picture
Most public discourse about cannabis legalization focuses on potential harms. This framework explicitly includes indicators for potential benefits, pushing back against one-sided evaluation of drug policy.
Questions still open
- Which of the 28 indicators show the most meaningful changes after legalization? Are the proposed metrics sensitive enough to detect real-world policy effects?
Common questions
What are the five themes used to evaluate legalization?
Does early evidence show legalization is harmful?
Read the original research
Guidelines for public health and safety metrics to evaluate the potential harms and benefits of cannabis regulation in Canada.
Drug and alcohol review, 38(6), 606-621
Citation
Lake, Stephanie; Kerr, Thomas; Werb, Dan; Haines-Saah, Rebecca; Fischer, Benedikt; Thomas, Gerald; Walsh, Zach; Ware, Mark A; Wood, Evan; Milloy, M-J. (2019). Guidelines for public health and safety metrics to evaluate the potential harms and benefits of cannabis regulation in Canada.. Drug and alcohol review, 38(6), 606-621. https://doi.org/10.1111/dar.12971
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