Colorado emergency departments are seeing more cannabis-related illnesses since legalization
Four years after legalization in Colorado, emergency departments reported increases in CHS, acute psychosis, cannabinoid catatonia, cardiac events, pediatric exposures, and hash-oil burn injuries.
Quick Facts
What This Study Found
Post-legalization ED presentations include cannabinoid hyperemesis, acute psychosis, cannabinoid catatonia syndrome, acute myo-pericarditis, pediatric ingestions, increases in fatal motor vehicle collisions, and hash-oil burn injuries. THC concentrations have risen dramatically (from 1-3 mg per joint in the 1990s to 18+ mg today). Some patients self-report using 2,000+ mg of THC daily.
Key Numbers
1990s joints: 1-3 mg THC. Current Colorado joints: 18+ mg THC. Some patients self-report 2,000+ mg THC/day. In 2015, 2.6 million new cannabis users, 45% aged 12-17.
How They Did This
Narrative review of cannabis-related health and safety effects observed in Colorado emergency departments over four years of legalization.
Why This Research Matters
Colorado was one of the first states to legalize recreational cannabis, making it a natural experiment. The ED data provides a real-world picture of health consequences that laboratory studies cannot capture.
The Bigger Picture
As more states and countries legalize cannabis, the Colorado experience serves as a preview of potential health system impacts. The dramatic increase in THC potency is a key factor in the severity of presentations.
What This Study Doesn't Tell Us
Narrative review from one state. Does not include systematic data collection or comparison to pre-legalization rates. Some conditions (like CHS) may have been underdiagnosed previously.
Questions This Raises
- ?Are these increases proportional to the increase in use, or is higher-potency cannabis producing more harm per user?
- ?Would regulatory limits on THC concentration reduce ED presentations?
- ?How do other legalized states compare?
Trust & Context
- Key Stat:
- THC per joint: from 1-3 mg in the 1990s to 18+ mg today
- Evidence Grade:
- Moderate: firsthand clinical observation from a major legalization state, but narrative review without systematic methodology.
- Study Age:
- Published in 2019.
- Original Title:
- Emergent Medical Illnesses Related to Cannabis Use.
- Published In:
- Missouri medicine, 116(3), 226-228 (2019)
- Authors:
- Randall, Karen, Hayward, Kathleen
- Database ID:
- RTHC-02249
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
What is cannabinoid catatonia syndrome?
A newly described condition seen in Colorado EDs where heavy cannabis users present with a catatonia-like state. It is distinct from traditional catatonia and appears related to high-dose THC exposure.
Does legalization cause more health problems?
This review documents increased ED presentations but cannot definitively attribute them solely to legalization. Increased reporting, higher potency products, and greater use all likely contribute.
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Cite This Study
https://rethinkthc.com/research/RTHC-02249APA
Randall, Karen; Hayward, Kathleen. (2019). Emergent Medical Illnesses Related to Cannabis Use.. Missouri medicine, 116(3), 226-228.
MLA
Randall, Karen, et al. "Emergent Medical Illnesses Related to Cannabis Use.." Missouri medicine, 2019.
RethinkTHC
RethinkTHC Research Database. "Emergent Medical Illnesses Related to Cannabis Use." RTHC-02249. Retrieved from https://rethinkthc.com/research/randall-2019-emergent-medical-illnesses-related
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.