Cannabis use disorder was a significant risk factor for violent behavior in early psychosis, especially combined with impulsivity or poor treatment adherence
A study of 265 early psychosis patients found that cannabis use disorder was a significant risk factor for violent behavior, with two high-risk profiles: CUD combined with impulsivity, or CUD combined with lack of insight and treatment non-adherence.
Quick Facts
What This Study Found
Researchers studied 265 early psychosis patients to understand how cannabis use disorder interacts with other risk factors for violent behavior.
Cannabis use disorder was independently associated with violent behavior during treatment.
Classification and Regression Tree (CART) analysis revealed two distinct patient profiles with elevated violence rates:
1. CUD + impulsivity: patients with both cannabis use disorder and high impulsivity had the highest rates of violent behavior.
2. CUD + lack of insight + treatment non-adherence: patients with cannabis use disorder who also lacked awareness of their illness and did not follow treatment had elevated violence rates.
Importantly, among patients with CUD, those who had good insight and treatment adherence had lower violence rates. This suggests that insight and treatment adherence can moderate the violence risk associated with cannabis use disorder in early psychosis.
Key Numbers
265 early psychosis patients. Two violence risk profiles identified via CART: (1) CUD + impulsivity, (2) CUD + lack of insight + non-adherence. Insight and treatment adherence moderated violence risk in CUD patients.
How They Did This
Retrospective analysis of 265 early psychosis patients from the TIPP program in Lausanne. Logistic regression for risk factors. CART analysis to identify hierarchical combinations of risk factors for violent behavior during treatment.
Why This Research Matters
Early psychosis patients are at elevated risk for both cannabis use and violent behavior. Identifying specific risk profiles (CUD + impulsivity, or CUD + poor insight + non-adherence) allows clinicians to target interventions more precisely rather than treating all early psychosis patients as equally at risk.
The Bigger Picture
Violence in psychosis is a sensitive topic often oversimplified. This study shows that cannabis use disorder alone does not determine violence risk. It is the combination with other dynamic (potentially treatable) factors that creates the highest risk, suggesting prevention pathways.
What This Study Doesn't Tell Us
Retrospective design. Single treatment program in Lausanne. Violent behavior was assessed during treatment, not in the community. CART analysis is exploratory and the identified profiles need prospective validation.
Questions This Raises
- ?Would treating CUD in early psychosis reduce violent behavior?
- ?Can impulsivity interventions lower violence risk in CUD patients?
- ?How should clinicians balance violence risk assessment with avoiding stigmatization of cannabis-using patients?
Trust & Context
- Key Stat:
- Two CUD-based violence profiles identified; insight and adherence moderated the risk
- Evidence Grade:
- Moderate. Adequate sample with sophisticated CART analysis, but retrospective design and single-site limit generalizability.
- Study Age:
- Published in 2018. Research on cannabis, psychosis, and violence risk continues to refine understanding of these complex interactions.
- Original Title:
- Cannabis, a Significant Risk Factor for Violent Behavior in the Early Phase Psychosis. Two Patterns of Interaction of Factors Increase the Risk of Violent Behavior: Cannabis Use Disorder and Impulsivity; Cannabis Use Disorder, Lack of Insight and Treatment Adherence.
- Published In:
- Frontiers in psychiatry, 9, 294 (2018)
- Authors:
- Moulin, Valerie(3), Baumann, Philipp, Gholamrezaee, Mehdi, Alameda, Luis, Palix, Julie, Gasser, Jacques, Conus, Philippe
- Database ID:
- RTHC-01771
Evidence Hierarchy
Looks back at existing records to find patterns.
What do these levels mean? →Frequently Asked Questions
Does cannabis make psychosis patients violent?
Cannabis use disorder was a risk factor for violence, but not on its own. The risk was highest when combined with impulsivity or with lack of insight and treatment non-adherence. Many CUD patients with good insight and treatment adherence did not show elevated violence.
What are "dynamic risk factors"?
Dynamic risk factors are characteristics that can change over time and potentially be treated (like impulsivity, substance use, insight, treatment adherence). Unlike static factors (age, gender, history), dynamic factors are targets for intervention to reduce future risk.
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Cite This Study
https://rethinkthc.com/research/RTHC-01771APA
Moulin, Valerie; Baumann, Philipp; Gholamrezaee, Mehdi; Alameda, Luis; Palix, Julie; Gasser, Jacques; Conus, Philippe. (2018). Cannabis, a Significant Risk Factor for Violent Behavior in the Early Phase Psychosis. Two Patterns of Interaction of Factors Increase the Risk of Violent Behavior: Cannabis Use Disorder and Impulsivity; Cannabis Use Disorder, Lack of Insight and Treatment Adherence.. Frontiers in psychiatry, 9, 294. https://doi.org/10.3389/fpsyt.2018.00294
MLA
Moulin, Valerie, et al. "Cannabis, a Significant Risk Factor for Violent Behavior in the Early Phase Psychosis. Two Patterns of Interaction of Factors Increase the Risk of Violent Behavior: Cannabis Use Disorder and Impulsivity; Cannabis Use Disorder, Lack of Insight and Treatment Adherence.." Frontiers in psychiatry, 2018. https://doi.org/10.3389/fpsyt.2018.00294
RethinkTHC
RethinkTHC Research Database. "Cannabis, a Significant Risk Factor for Violent Behavior in ..." RTHC-01771. Retrieved from https://rethinkthc.com/research/moulin-2018-cannabis-a-significant-risk
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.