A proposed "cannabinoid hypothesis" of schizophrenia describes multiple pathways through which THC may trigger psychosis, paralleling existing dopamine, serotonin, and glutamate hypotheses.
Psychiatry researchers, people with family history of psychosis, clinicians
Multiple putative pathways from cannabis to psychosis identified
What the researchers found
The review describes several putative pathways from cannabis to psychosis, integrating evidence about the endocannabinoid system, THC's effects on dopamine and glutamate signaling, and the connection between cannabis use and first-episode psychosis.
Why it matters
Understanding the specific biological pathways through which cannabis may trigger psychosis could enable targeted prevention strategies for susceptible individuals.
The numbers in context
Hypothesis parallels existing dopamine, serotonin, and glutamate hypotheses of schizophrenia
How the study worked
Narrative review synthesizing evidence about the endocannabinoid system, THC's neurochemical effects, and epidemiological links between cannabis and psychosis to propose a unified cannabinoid hypothesis.
What this study cannot tell us
Narrative review proposing a hypothesis rather than testing one. Pathways described are "putative" and not fully established.
How to read the evidence
Narrative review proposing a hypothesis based on existing evidence rather than presenting new data.
When this study was published
Published in 2022
The bigger picture
Just as stimulant-induced psychosis led to the dopamine hypothesis and psychedelic-induced states led to the serotonin hypothesis, cannabis-induced psychosis may reveal a distinct endocannabinoid pathway to schizophrenia.
Questions still open
- Can genetic variation in the endocannabinoid system identify who is most vulnerable to cannabis-induced psychosis? Would targeted interventions based on these pathways prevent schizophrenia in at-risk cannabis users?
Common questions
What is the cannabinoid hypothesis of schizophrenia?
Does cannabis cause schizophrenia?
Read the original research
A Cannabinoid Hypothesis of Schizophrenia: Pathways to Psychosis.
Innovations in clinical neuroscience, 19(7-9), 38-43
Citation
Little, Rachel; D'Mello, Dale. (2022). A Cannabinoid Hypothesis of Schizophrenia: Pathways to Psychosis.. Innovations in clinical neuroscience, 19(7-9), 38-43.
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