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.
Psychiatrists, emergency physicians, and cannabis users considering concentrated products.
Psychosis emerged after switching to dabs (up to 80% THC) despite years of regular marijuana use
What the researchers 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.
Why it 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 numbers in context
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 the study worked
Single case report describing clinical presentation, differential diagnosis, and management of cannabis-induced psychosis precipitated by high-potency cannabis concentrates.
What this study cannot 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.
How to read the evidence
Preliminary: single case report; illustrative but cannot establish causation.
When this study was published
Published 2020.
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.
Questions still open
- 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?
Common questions
What are "dabs" and why are they risky?
Can experienced cannabis users develop psychosis?
Read the original research
A Little Dab Will Do: A Case of Cannabis-Induced Psychosis.
Cureus, 12(9), e10311
Citation
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
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