A meta-analysis of eight nationally representative surveys found that people with cannabis use disorder were about three times more likely to also have major depression or generalized anxiety disorder.
Anyone interested in the relationship between cannabis use disorder and mental health conditions, particularly clinicians and patients dealing with co-occurring conditions.
3x odds of depression and anxiety
What the researchers found
Cannabis use disorder was strongly associated with major depressive episodes (OR 3.22; 95% CI 2.31-4.49) and with generalized anxiety disorder (OR 2.99; 95% CI 2.14-4.16). Both 12-month and lifetime comorbidity estimates showed consistent patterns of co-occurrence.
Why it matters
The threefold co-occurrence of cannabis use disorder with depression and anxiety underscores the complexity of treating either condition in isolation. Integrated treatment approaches may be needed for this substantial overlap.
The numbers in context
8 nationally representative surveys; CUD + major depression OR 3.22 (95% CI 2.31-4.49); CUD + GAD OR 2.99 (95% CI 2.14-4.16)
How the study worked
Systematic review and meta-analysis of Medline, CINAHL, PsycINFO, EMBASE, and grey literature. Included 8 nationally representative epidemiological surveys of non-clinical, randomly selected adult populations. Random-effects model used to address heterogeneity.
What this study cannot tell us
Cross-sectional surveys cannot determine causal direction. Heterogeneity from combining studies across geographic regions with different diagnostic criteria. Self-report measures used in population surveys.
How to read the evidence
Meta-analysis of nationally representative surveys with consistent effect sizes, though cross-sectional design limits causal inference.
When this study was published
Published in 2021; large-scale longitudinal studies may further clarify causal directions.
The bigger picture
Whether cannabis use disorder causes depression and anxiety, or whether people with these conditions are more likely to develop problematic cannabis use, remains an open question. Regardless of direction, the consistent threefold association across large population samples signals that screening for one condition should prompt assessment for the others.
Questions still open
- Does treating cannabis use disorder improve depression and anxiety outcomes, or vice versa? Are certain cannabis use patterns (frequency, potency, age of onset) more strongly linked to psychiatric comorbidity? Would integrated treatment approaches improve outcomes compared to treating each condition separately?
Common questions
Does cannabis cause depression?
How strong is the link with anxiety?
What does "nationally representative" mean for this research?
Read the original research
Comorbid Cannabis Use Disorder with Major Depression and Generalized Anxiety Disorder: A Systematic Review with Meta-analysis of Nationally Representative Epidemiological Surveys.
Journal of affective disorders, 281, 467-475
Citation
Onaemo, Vivian N; Fawehinmi, Timothy O; D'Arcy, Carl. (2021). Comorbid Cannabis Use Disorder with Major Depression and Generalized Anxiety Disorder: A Systematic Review with Meta-analysis of Nationally Representative Epidemiological Surveys.. Journal of affective disorders, 281, 467-475. https://doi.org/10.1016/j.jad.2020.12.043
Explore the wider topic
- Physical vs Psychological Cannabis Dependence: What Science Actually Shows
- The Gap Between Cannabis Perception and Science: Why What We Believe Outpaces What We Know
- Cannabis Use Disorder: Am I Addicted? Self-Assessment Guide
- Cross-Addiction After Quitting Weed: When One Habit Replaces Another
- Is Weed Addictive? What the Research Actually Shows
- Is Cannabis Addictive? What the DSM-5 and Brain Science Say
- Quitting Weed and Alcohol Together: What to Know About Dual Cessation
- Is Rehab Necessary for Weed? An Honest Assessment
- Signs You May Have Cannabis Use Disorder: An Honest Self-Assessment
- Weed Vape Pen Addiction: Why Vaping Makes It Harder to Quit