Researchers Warn of a Growing Epidemic of Drug-Induced Psychosis
A review argues that rising recreational use of methamphetamine and high-potency cannabis over 30 years has driven a substantial increase in drug-induced psychosis, with 25-50% of cases progressing to schizophrenia.
Quick Facts
What This Study Found
Drug-induced psychosis from methamphetamine and cannabis has become more common over three decades. Between 25% and 50% of drug-induced psychosis cases progress to schizophrenia within five years. Cannabis potency has increased substantially, particularly in jurisdictions that have legalized it.
Key Numbers
25-50% of drug-induced psychoses progress to schizophrenia within 5 years; worldwide legal cannabis sales for 2025 estimated at $65 billion; 30-year trend of increasing drug-induced psychosis.
How They Did This
Narrative review and commentary synthesizing epidemiological evidence, policy analysis, and clinical observations on trends in drug-induced psychosis from methamphetamine and cannabis.
Why This Research Matters
The comparison to the obesity epidemic is provocative but grounded in a real pattern: policy and market changes driving population-level health consequences that emerge gradually. The 25-50% progression rate from drug-induced psychosis to schizophrenia represents a significant clinical concern.
The Bigger Picture
This paper sits within a growing body of literature connecting cannabis commercialization, rising potency, and psychosis risk. The authors frame the current moment as the beginning of a potential epidemic, analogous to predictions about obesity in the 1980s.
What This Study Doesn't Tell Us
Commentary-style paper with selective evidence presentation. Does not systematically assess all available evidence. The epidemic framing may overstate the certainty of future trends. Does not account for potential benefits of legalization such as reduced criminalization.
Questions This Raises
- ?Will public education campaigns similar to anti-smoking efforts be effective for cannabis?
- ?How much of the psychosis increase is attributable to increased potency versus increased use?
- ?Are psychiatric services in legalized jurisdictions already showing strain?
Trust & Context
- Key Stat:
- 25-50% of drug-induced psychoses progress to schizophrenia within 5 years
- Evidence Grade:
- Moderate: Draws on established epidemiological evidence but presents it through a commentary lens with selective citation rather than systematic methodology.
- Study Age:
- Published in 2025, reflecting current policy landscape.
- Original Title:
- The rising tide of drug-induced psychosis.
- Published In:
- Neuropsychiatrie : Klinik, Diagnostik, Therapie und Rehabilitation : Organ der Gesellschaft Osterreichischer Nervenarzte und Psychiater (2025)
- Authors:
- Murray, Robin M(27), Paparelli, Alessandra, Di Forti, Marta(26), Morrison, Paul
- Database ID:
- RTHC-07214
Evidence Hierarchy
Summarizes existing research without a strict systematic method.
What do these levels mean? →Frequently Asked Questions
What is drug-induced psychosis?
Drug-induced psychosis is a condition where substance use triggers psychotic symptoms like hallucinations and delusions. It can occur during intoxication or withdrawal and in some cases represents the first episode of a longer-term psychotic disorder.
How does cannabis potency relate to psychosis risk?
Higher-potency cannabis products deliver more THC per dose. Research has linked high-potency cannabis use to elevated rates of psychotic experiences, and the authors note that potency has increased substantially in legalized markets.
Read More on RethinkTHC
- THC-amygdala-anxiety-brain
- anandamide-weed-withdrawal
- cannabinoid-receptors-recovery-time
- cannabis-developing-brain-teenagers
- cant-enjoy-anything-without-weed
- dopamine-recovery-after-quitting-weed
- endocannabinoid-system-explained-simply
- endocannabinoid-system-withdrawal
- nervous-system-weed-withdrawal-fight-flight
- teen-weed-use-under-18-effects-brain
- thc-brain-withdrawal
- thc-prefrontal-cortex-brain-effects
- weed-cortisol-stress-hormones
- weed-memory-loss-recovery
- weed-motivation-amotivational-syndrome
- weed-nervous-system-effects
- weed-reward-system-brain
Cite This Study
https://rethinkthc.com/research/RTHC-07214APA
Murray, Robin M; Paparelli, Alessandra; Di Forti, Marta; Morrison, Paul. (2025). The rising tide of drug-induced psychosis.. Neuropsychiatrie : Klinik, Diagnostik, Therapie und Rehabilitation : Organ der Gesellschaft Osterreichischer Nervenarzte und Psychiater. https://doi.org/10.1007/s40211-025-00541-7
MLA
Murray, Robin M, et al. "The rising tide of drug-induced psychosis.." Neuropsychiatrie : Klinik, 2025. https://doi.org/10.1007/s40211-025-00541-7
RethinkTHC
RethinkTHC Research Database. "The rising tide of drug-induced psychosis." RTHC-07214. Retrieved from https://rethinkthc.com/research/murray-2025-the-rising-tide-of
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.