What Actually Puts People at Risk for Cannabis Use Disorder?
An umbrella review of meta-analyses found that while many risk factors for cannabis, cocaine, and opioid use disorders were statistically significant, none had convincing evidence, with antisocial behavior showing the strongest link to cannabis use disorder.
Quick Facts
What This Study Found
Of 19 associations between 12 risk/protective factors and substance use disorders, none reached "convincing" evidence. Sensitivity analyses found convincing evidence only for antisocial behavior predicting cannabis use disorder (OR=3.34, 95% CI: 2.53-4.41). Smoking had highly suggestive evidence for nonmedical prescription opioid use (OR=3.07).
Key Numbers
3,072 initial references; 5 meta-analyses included; 19 associations examined; 12 risk/protective factors; cases: 4,539; total N: over 1.1 billion; 84% of associations statistically significant but none convincing; antisocial behavior and CUD OR=3.34 in sensitivity analysis.
How They Did This
Umbrella review of meta-analyses of observational studies from PubMed-MEDLINE/PsycInfo (through September 2020), grading evidence credibility from "not significant" to "convincing" using established criteria, with quality assessment via AMSTAR-2.
Why This Research Matters
Despite many claimed risk factors for substance use disorders, this rigorous evaluation shows that very few have truly strong evidence, which should guide prevention efforts toward the most well-supported targets.
The Bigger Picture
The gap between the number of claimed risk factors and those with convincing evidence highlights the need for higher-quality longitudinal research on what truly predicts substance use disorder development.
What This Study Doesn't Tell Us
Limited to published meta-analyses which may have their own quality issues; 40% of included meta-analyses rated critically low quality; cannot examine interactions between risk factors.
Questions This Raises
- ?Why do so few risk factors for substance use disorders have convincing evidence?
- ?Would newer, better-designed longitudinal studies change the evidence grades?
Trust & Context
- Key Stat:
- Only antisocial behavior had convincing evidence as a risk factor for cannabis use disorder
- Evidence Grade:
- Rigorous umbrella review methodology with evidence grading, limited by the quality of underlying meta-analyses.
- Study Age:
- Search through September 2020.
- Original Title:
- Risk and protective factors for cannabis, cocaine, and opioid use disorders: An umbrella review of meta-analyses of observational studies.
- Published In:
- Neuroscience and biobehavioral reviews, 126, 243-251 (2021)
- Authors:
- Solmi, Marco(11), Dragioti, Elena(2), Croatto, Giovanni(2), Radua, Joaquim, Borgwardt, Stefan, Carvalho, Andrè F, Demurtas, Jacopo, Mosina, Anna, Kurotschka, Peter Konstantin, Shin, Jae Il, Fusar-Poli, Paolo
- Database ID:
- RTHC-03537
Evidence Hierarchy
Combines results from multiple studies to find an overall pattern.
What do these levels mean? →Frequently Asked Questions
What predicts cannabis use disorder?
This umbrella review found that antisocial behavior was the only risk factor with convincing evidence for predicting cannabis use disorder (OR=3.34). While many other factors were statistically significant, their evidence quality was weak.
Why aren't more risk factors considered convincing?
The "convincing" standard requires consistent results across large studies with minimal bias. Most existing meta-analyses on substance use disorder risk factors had methodological limitations that prevented their findings from reaching this threshold.
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Cite This Study
https://rethinkthc.com/research/RTHC-03537APA
Solmi, Marco; Dragioti, Elena; Croatto, Giovanni; Radua, Joaquim; Borgwardt, Stefan; Carvalho, Andrè F; Demurtas, Jacopo; Mosina, Anna; Kurotschka, Peter Konstantin; Shin, Jae Il; Fusar-Poli, Paolo. (2021). Risk and protective factors for cannabis, cocaine, and opioid use disorders: An umbrella review of meta-analyses of observational studies.. Neuroscience and biobehavioral reviews, 126, 243-251. https://doi.org/10.1016/j.neubiorev.2021.03.014
MLA
Solmi, Marco, et al. "Risk and protective factors for cannabis, cocaine, and opioid use disorders: An umbrella review of meta-analyses of observational studies.." Neuroscience and biobehavioral reviews, 2021. https://doi.org/10.1016/j.neubiorev.2021.03.014
RethinkTHC
RethinkTHC Research Database. "Risk and protective factors for cannabis, cocaine, and opioi..." RTHC-03537. Retrieved from https://rethinkthc.com/research/solmi-2021-risk-and-protective-factors
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.