Review examines cannabis effects across major psychiatric disorders and proposes a framework for understanding addiction risk
Limited data supports beneficial effects of cannabis for psychiatric conditions, while evidence of harm in psychotic and mood disorders continues to grow, especially among those seeking short-term reward.
Quick Facts
What This Study Found
The review found increasing documentation of potential harms from cannabis use in patients with psychotic and mood disorders, while data supporting beneficial effects in psychiatric populations remains limited. A reconciled addiction vulnerability and allostatic model was proposed to explain why mentally ill individuals are particularly susceptible to cannabis use disorders.
Key Numbers
The review covers effects across three major psychiatric disorder categories: psychotic disorders (schizophrenia), mood disorders, and anxiety disorders.
How They Did This
Narrative review of cannabis effects across schizophrenia, mood disorders, and anxiety disorders, combined with a theoretical framework integrating addiction vulnerability and allostatic hypotheses.
Why This Research Matters
With cannabis legalization expanding, people with mental illness represent a particularly vulnerable population who may be attracted to cannabis for symptom relief while being at elevated risk for adverse effects.
The Bigger Picture
The tension between cannabis's perceived benefits and documented risks in mental illness reflects a broader challenge in drug policy: how to regulate access while protecting vulnerable populations who may be most drawn to use.
What This Study Doesn't Tell Us
Narrative review without systematic methodology. The proposed theoretical framework for understanding co-morbid addiction has not been empirically tested. Evidence base varies in quality across disorder types.
Questions This Raises
- ?Can cannabis formulations (e.g., high-CBD, low-THC) be designed to provide psychiatric benefit without the risks associated with high-THC products?
- ?How should mental health screening be integrated into cannabis access programs?
Trust & Context
- Key Stat:
- Limited benefit, growing harm evidence
- Evidence Grade:
- Moderate: comprehensive narrative review across multiple disorder types, with a novel theoretical framework.
- Study Age:
- Published in 2019.
- Original Title:
- Cannabis and mental illness: a review.
- Published In:
- European archives of psychiatry and clinical neuroscience, 269(1), 107-120 (2019)
- Authors:
- Lowe, Darby J E(3), Sasiadek, Julia D, Coles, Alexandria S, George, Tony P
- Database ID:
- RTHC-02146
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
Is cannabis safe for people with mental illness?
This review found limited evidence for benefits and increasing documentation of harms, particularly in psychotic and mood disorders.
Why are people with mental illness at higher risk from cannabis?
The authors propose that mental illness creates both biological vulnerability and strong motivation for short-term reward, making these individuals more susceptible to problematic cannabis use.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-02146APA
Lowe, Darby J E; Sasiadek, Julia D; Coles, Alexandria S; George, Tony P. (2019). Cannabis and mental illness: a review.. European archives of psychiatry and clinical neuroscience, 269(1), 107-120. https://doi.org/10.1007/s00406-018-0970-7
MLA
Lowe, Darby J E, et al. "Cannabis and mental illness: a review.." European archives of psychiatry and clinical neuroscience, 2019. https://doi.org/10.1007/s00406-018-0970-7
RethinkTHC
RethinkTHC Research Database. "Cannabis and mental illness: a review." RTHC-02146. Retrieved from https://rethinkthc.com/research/lowe-2019-cannabis-and-mental-illness
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.