Recreational Cannabis Laws Initially Reduced Opioid Misuse, but the Effect Faded After 2-3 Years
Analysis of national survey data found recreational marijuana laws initially reduced frequent prescription opioid misuse, but the effect dissipated after only 2-3 years when using methods that account for staggered state adoption.
Quick Facts
What This Study Found
Standard difference-in-differences analysis suggested RML adoption reduced frequent opioid misuse. However, a two-stage procedure accounting for staggered treatment timing showed the opposite direction. Event study estimates suggested an initial decrease in opioid misuse that dissipated after 2-3 years, indicating the benefit was temporary.
Key Numbers
Standard DD showed reduced opioid misuse; two-stage procedure showed the DD estimate became positive; event study showed initial decrease dissipating after 2-3 years
How They Did This
Analysis of National Survey on Drug Use and Health microdata examining recreational marijuana laws and prescription opioid misuse (OxyContin, Percocet, Vicodin). Used both standard difference-in-differences regression and a two-stage procedure designed for staggered treatment adoption and dynamic effects.
Why This Research Matters
The finding that the opioid substitution effect of cannabis is temporary challenges the hopeful narrative that cannabis legalization can durably reduce the opioid crisis. Initial benefits may fade as novelty wears off or as people return to prior patterns.
The Bigger Picture
Previous research celebrating opioid reductions from cannabis legalization may have been premature. If the substitution effect is temporary, relying on cannabis legalization as an opioid crisis strategy without sustained complementary interventions may not work long-term.
What This Study Doesn't Tell Us
Observational study cannot prove causation. Different statistical methods produced different results, introducing uncertainty. Self-reported substance use data may underestimate misuse. Staggered legalization across states complicates temporal comparisons.
Questions This Raises
- ?Why does the opioid reduction effect dissipate?
- ?Could sustained public health campaigns maintain the substitution effect?
- ?Does the temporary reduction reflect initial curiosity about cannabis as a pain alternative that fades?
Trust & Context
- Key Stat:
- Effect fades after 2-3 years
- Evidence Grade:
- Rigorous econometric analysis of national survey data with multiple methods, though different approaches yielded different results
- Study Age:
- 2023 study
- Original Title:
- Recreational marijuana laws and the misuse of prescription opioids: Evidence from National Survey on Drug Use and Health microdata.
- Published In:
- Health economics, 32(2), 277-301 (2023)
- Authors:
- Ali, Mir M(3), McClellan, Chandler(2), Mutter, Ryan(2), Rees, Daniel I
- Database ID:
- RTHC-04360
Evidence Hierarchy
Looks back at existing records to find patterns.
What do these levels mean? →Frequently Asked Questions
Does cannabis legalization reduce opioid use?
Initially, yes. This study found recreational marijuana laws were associated with reduced opioid misuse, but the effect disappeared after 2-3 years, suggesting the benefit is temporary.
Why did different statistical methods produce different results?
Standard methods treat all state legalizations as simultaneous, which can bias results when states legalize at different times. More sophisticated methods accounting for staggered adoption showed the reduction was short-lived.
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Cite This Study
https://rethinkthc.com/research/RTHC-04360APA
Ali, Mir M; McClellan, Chandler; Mutter, Ryan; Rees, Daniel I. (2023). Recreational marijuana laws and the misuse of prescription opioids: Evidence from National Survey on Drug Use and Health microdata.. Health economics, 32(2), 277-301. https://doi.org/10.1002/hec.4620
MLA
Ali, Mir M, et al. "Recreational marijuana laws and the misuse of prescription opioids: Evidence from National Survey on Drug Use and Health microdata.." Health economics, 2023. https://doi.org/10.1002/hec.4620
RethinkTHC
RethinkTHC Research Database. "Recreational marijuana laws and the misuse of prescription o..." RTHC-04360. Retrieved from https://rethinkthc.com/research/ali-2023-recreational-marijuana-laws-and
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.