ER Visits for Cannabis Intoxication Jumped After Michigan Legalized Recreational Use
Emergency department visits for acute cannabis intoxication increased 47-70% after recreational cannabis legalization in Michigan.
Quick Facts
What This Study Found
After Michigan legalized recreational cannabis in December 2018, cannabis-related ED visits increased significantly (unadjusted RR 1.70; age-adjusted RR 1.47). The increase was immediate.
Key Numbers
2,177 ED visits from 2,066 patients; 671 pre-legalization, 1,506 post; unadjusted RR 1.70; age-adjusted RR 1.47; 8 hospitals
How They Did This
Retrospective observational cohort across 8 hospitals in southeast Michigan, 2016-2022, using ICD-10 codes and negative-binomial regression.
Why This Research Matters
The immediate 47% jump provides concrete evidence for health systems planning around legalization.
The Bigger Picture
This adds to evidence that recreational legalization is associated with increased ED presentations.
What This Study Doesn't Tell Us
Single health system. Relied on ICD-10 codes. Pre-existing upward trend complicates attribution.
Questions This Raises
- ?What product types drive ED visits?
- ?Do these visits result in significant interventions?
Trust & Context
- Key Stat:
- 47% increase in cannabis-related ER visits after legalization (age-adjusted)
- Evidence Grade:
- Multi-hospital retrospective study with appropriate modeling but limited to one health system.
- Study Age:
- Published in 2024 with data from 2016-2022.
- Original Title:
- The impact of recreational cannabis legalization on ED visit rates for acute cannabis intoxication.
- Published In:
- The American journal of emergency medicine, 84, 124-129 (2024)
- Authors:
- Nguyen, An, Lee, Ray, Zhao, Lili, Qu, Lihua, Todd, Brett
- Database ID:
- RTHC-05590
Evidence Hierarchy
Looks back at existing records to find patterns.
What do these levels mean? →Frequently Asked Questions
Did the increase happen right away?
Yes, in the first month after legalization.
Which age groups were most affected?
All age groups, with middle-aged adults particularly notable.
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Cite This Study
https://rethinkthc.com/research/RTHC-05590APA
Nguyen, An; Lee, Ray; Zhao, Lili; Qu, Lihua; Todd, Brett. (2024). The impact of recreational cannabis legalization on ED visit rates for acute cannabis intoxication.. The American journal of emergency medicine, 84, 124-129. https://doi.org/10.1016/j.ajem.2024.07.041
MLA
Nguyen, An, et al. "The impact of recreational cannabis legalization on ED visit rates for acute cannabis intoxication.." The American journal of emergency medicine, 2024. https://doi.org/10.1016/j.ajem.2024.07.041
RethinkTHC
RethinkTHC Research Database. "The impact of recreational cannabis legalization on ED visit..." RTHC-05590. Retrieved from https://rethinkthc.com/research/nguyen-2024-the-impact-of-recreational
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.