A long-time marijuana user developed psychosis only after switching to high-potency "dabs" with up to 80% THC
A case report describes a man who used marijuana from age 13 without psychotic symptoms but developed paranoid delusions, insomnia, and functional impairment within one month of switching to "dabs" containing up to 80% THC.
Quick Facts
What This Study Found
A patient who had used marijuana since age 13 for anxiety without psychotic episodes developed severe paranoid delusions (being watched and followed), insomnia for two weeks, and hypervigilant behavior after switching to "dabbing" (concentrated cannabis with up to 80% THC). Symptoms escalated over one month and significantly impaired work functioning. Urine was positive for cannabis only.
Key Numbers
Cannabis use since age 13; dabs up to 80% THC; psychotic symptoms within 1 month of switching; 2 weeks without sleep; paranoid delusions of surveillance.
How They Did This
Single case report describing clinical presentation, differential diagnosis, and management of cannabis-induced psychosis precipitated by high-potency cannabis concentrates.
Why This Research Matters
This case highlights the dose-potency distinction in cannabis risk. A user who tolerated conventional marijuana for years developed psychosis specifically after switching to concentrates, suggesting a THC threshold effect that product potency can push beyond.
The Bigger Picture
As cannabis concentrates with 60-90% THC become widely available in legal markets, psychosis risks may increase even among experienced users who previously tolerated lower-potency products. Product potency, not just use vs non-use, may be the critical risk variable.
What This Study Doesn't Tell Us
Single case report; cannot establish causation; pre-existing vulnerability possible; no genetic testing for psychosis risk; other stressors (work, social) may have contributed; no THC blood level measured.
Questions This Raises
- ?Should cannabis concentrates above certain THC thresholds carry specific psychosis warnings?
- ?Is there a THC dose threshold below which psychosis risk is minimal even for vulnerable individuals?
Trust & Context
- Key Stat:
- Psychosis emerged after switching to dabs (up to 80% THC) despite years of regular marijuana use
- Evidence Grade:
- Preliminary: single case report; illustrative but cannot establish causation.
- Study Age:
- Published 2020.
- Original Title:
- A Little Dab Will Do: A Case of Cannabis-Induced Psychosis.
- Published In:
- Cureus, 12(9), e10311 (2020)
- Authors:
- Rossi, Garrett, Beck, Melanie
- Database ID:
- RTHC-02807
Evidence Hierarchy
Describes what happened to one person or a small group.
What do these levels mean? →Frequently Asked Questions
What are "dabs" and why are they risky?
Dabs are highly concentrated cannabis extracts containing up to 80% THC, far exceeding typical marijuana (15-25%). In this case, a man who used regular marijuana for years developed psychosis only after switching to dabs.
Can experienced cannabis users develop psychosis?
Yes. This patient used marijuana since age 13 without psychotic symptoms. Psychosis developed specifically after switching to high-potency concentrates, suggesting product potency can push even experienced users past a risk threshold.
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Cite This Study
https://rethinkthc.com/research/RTHC-02807APA
Rossi, Garrett; Beck, Melanie. (2020). A Little Dab Will Do: A Case of Cannabis-Induced Psychosis.. Cureus, 12(9), e10311. https://doi.org/10.7759/cureus.10311
MLA
Rossi, Garrett, et al. "A Little Dab Will Do: A Case of Cannabis-Induced Psychosis.." Cureus, 2020. https://doi.org/10.7759/cureus.10311
RethinkTHC
RethinkTHC Research Database. "A Little Dab Will Do: A Case of Cannabis-Induced Psychosis." RTHC-02807. Retrieved from https://rethinkthc.com/research/rossi-2020-a-little-dab-will
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.