A comprehensive Lancet review finds cannabis legalization has increased use in some populations and raised concerns about road crashes, while warning that commercial cannabis industries may follow the harmful marketing patterns of alcohol and tobacco.
Policymakers, public health advocates, cannabis industry observers, and anyone interested in the societal impacts of cannabis legalization.
Lancet warns commercial cannabis may follow alcohol/tobacco industry's resistance to regulation
What the researchers found
Cannabis legalisation has been associated with increased use in some populations and possible increases in road crashes. Medicinal cannabis regulations may have increased recreational use. The review warns that profit-driven commercial cannabis industries may resist effective regulation, as seen with alcohol and tobacco.
Why it matters
Published in one of the world's top medical journals, this is the most authoritative overview of legalization's public health implications. Its warning about commercial cannabis following the alcohol/tobacco playbook is particularly relevant for countries still deciding on legalization models.
The numbers in context
Cannabis is the most commonly used illicit drug globally. Legalization associated with increased use in some populations. Road crash concerns documented. Alcohol and tobacco policy examples used to project long-term cannabis industry effects.
How the study worked
Comprehensive review published in The Lancet assessing public health impacts of cannabis legalization in the Americas, covering use patterns, health effects, medicinal evidence, regulatory approaches, effects on use and harms, and policy recommendations.
What this study cannot tell us
Most legalization data comes from US states and Canada with relatively short follow-up periods. Long-term effects are projected from alcohol/tobacco analogies, which may not perfectly predict cannabis industry behavior. Policy recommendations may not apply to all regulatory contexts.
How to read the evidence
Strong: comprehensive review published in The Lancet synthesizing evidence across multiple policy domains.
When this study was published
Published in 2019.
The bigger picture
The review draws a critical historical parallel: alcohol and tobacco industries consistently opposed effective regulation despite known harms. If cannabis follows the same commercial model, public health measures like advertising restrictions, plain packaging, and taxation may face industry resistance.
Questions still open
- Can cannabis legalization models avoid the harms of commercial alcohol and tobacco? What is the optimal tax rate to minimize harms without creating a black market? Would government-run monopoly models outperform commercial models for public health?
Common questions
Has legalization made cannabis use more common?
What can we learn from alcohol and tobacco regulation?
Read the original research
Public health implications of legalising the production and sale of cannabis for medicinal and recreational use.
Lancet (London, England), 394(10208), 1580-1590
Citation
Hall, Wayne; Stjepanović, Daniel; Caulkins, Jonathan; Lynskey, Michael; Leung, Janni; Campbell, Gabrielle; Degenhardt, Louisa. (2019). Public health implications of legalising the production and sale of cannabis for medicinal and recreational use.. Lancet (London, England), 394(10208), 1580-1590. https://doi.org/10.1016/S0140-6736(19)31789-1
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