Alcohol and Cannabis Connect to Different Mental Health Symptoms — and the Pattern Doesn't Change with Age
Alcohol problems link uniquely to anxiety, personality issues, and suicidal thoughts, while cannabis problems link to mania and dissociation — and these patterns remain stable across the lifespan.
Quick Facts
What This Study Found
Alcohol-cannabis co-users had higher severity on all mental health symptoms vs. alcohol-only users, yet network structures were similar. Key distinction: alcohol problems uniquely linked to anxiety, personality functioning, and suicidal ideation, while cannabis problems linked to mania and dissociation. Somatic symptoms were significantly more central in co-users. Age did not moderate these relationships.
Key Numbers
740 participants (16-81 years). Co-users higher on all mental health measures (all p≤0.001). Alcohol problems→anxiety (r=0.03), personality (r=0.01), suicidal ideation (r=0.01). Cannabis problems→mania (r=0.05), dissociation (r=0.02). Somatic centrality: 1.31 in co-use vs 0.17 in alcohol-only.
How They Did This
Network analysis of 740 participants aged 16-81 (446 alcohol users, 294 alcohol-cannabis co-users) from online international survey. Mental health assessed via DSM Level 1 Cross-Cutting Symptom Measure; substance use via AUDIT and CUDIT-R.
Why This Research Matters
Knowing that alcohol and cannabis problems connect to different mental health symptoms — anxiety/suicidality vs. mania/dissociation — allows clinicians to screen for specific psychiatric risks based on which substances a patient uses.
The Bigger Picture
The stability of these substance-symptom patterns across ages suggests they reflect fundamental neurobiological relationships rather than cohort effects — meaning these clinical associations are likely to hold across generations.
What This Study Doesn't Tell Us
Cross-sectional design cannot determine causation. Online convenience sample from multiple countries may not be representative. Network edges are associations, not causal pathways. Relatively small co-use group (294).
Questions This Raises
- ?Do the alcohol-anxiety and cannabis-mania links reflect shared neurobiology or common risk factors?
- ?Should dual-use screening protocols differ from single-substance ones?
- ?Could treating specific mental health symptoms reduce substance-specific use?
Trust & Context
- Key Stat:
- Evidence Grade:
- Innovative network methodology with broad age range, limited by cross-sectional design, convenience sample, and moderate co-user group size.
- Study Age:
- Published 2026, using data from English and Dutch-speaking participants across multiple countries.
- Original Title:
- Understanding the interplay between alcohol use, cannabis use and mental health across the lifespan: A network analysis.
- Published In:
- Addiction (Abingdon, England) (2026)
- Authors:
- Macedo, Inês(3), Kroon, Emese(7), Colyer-Patel, Karis, Freichel, René, Romein, Christophe, Pasion, Rita, Barbosa, Fernando, Cousijn, Janna
- Database ID:
- RTHC-08455
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Do alcohol and cannabis affect mental health differently?
Yes — alcohol problems were uniquely linked to anxiety, personality issues, and suicidal thoughts, while cannabis problems connected to mania and dissociation. Co-users had worse symptoms overall but the underlying patterns were similar to alcohol-only users.
Does age change how substances affect mental health?
No — these substance-mental health patterns were remarkably stable across participants aged 16 to 81, suggesting fundamental rather than age-dependent relationships.
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Cite This Study
https://rethinkthc.com/research/RTHC-08455APA
Macedo, Inês; Kroon, Emese; Colyer-Patel, Karis; Freichel, René; Romein, Christophe; Pasion, Rita; Barbosa, Fernando; Cousijn, Janna. (2026). Understanding the interplay between alcohol use, cannabis use and mental health across the lifespan: A network analysis.. Addiction (Abingdon, England). https://doi.org/10.1111/add.70324
MLA
Macedo, Inês, et al. "Understanding the interplay between alcohol use, cannabis use and mental health across the lifespan: A network analysis.." Addiction (Abingdon, 2026. https://doi.org/10.1111/add.70324
RethinkTHC
RethinkTHC Research Database. "Understanding the interplay between alcohol use, cannabis us..." RTHC-08455. Retrieved from https://rethinkthc.com/research/macedo-2026-understanding-the-interplay-between
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.