Why Depression Leads to Cannabis Problems Specifically in LGBTQ+ Youth
Depression at age 17 predicted cannabis use problems at 23 only in sexually diverse youth, fully explained by using cannabis to cope with negative emotions.
Quick Facts
What This Study Found
Depression symptoms at 17 predicted cannabis use problems at 23 among sexually diverse participants only, and this was fully mediated by coping motives. Coping motives were strongly predicted by depression in sexually diverse but not heterosexual youth. Enhancement motives predicted problems in both groups but weren't driven by mental health. Depression also predicted social motives in diverse youth only.
Key Numbers
471 total participants (425 heterosexual, 46 sexually diverse). Depression at 17 predicted CU problems at 23 in diverse youth only. Coping motives fully mediated this pathway. Enhancement motives predicted problems in both groups.
How They Did This
Longitudinal data from Quebec Longitudinal Study of Child Development with self-reports at ages 17 and 23. Sample: 425 heterosexual and 46 sexually diverse participants assessed on depression, anxiety, cannabis use frequency, motives, and problems.
Why This Research Matters
LGBTQ+ youth face disproportionate mental health burdens and substance use risks. This study identifies the specific pathway — depression driving coping-motivated cannabis use — which can be targeted by prevention programs.
The Bigger Picture
The finding that the depression-to-cannabis-problems pathway exists specifically in LGBTQ+ youth suggests that minority stress — not just depression itself — creates unique vulnerability. Building coping skills beyond cannabis could break this cycle.
What This Study Doesn't Tell Us
Small sexually diverse subsample (n=46) limits statistical power and generalizability. Quebec-specific context. Binary sexual diversity measure may obscure differences within LGBTQ+ communities. Self-report measures.
Questions This Raises
- ?Would teaching alternative coping skills to LGBTQ+ youth prevent cannabis use problems?
- ?Do these pathways differ across specific sexual minority identities?
- ?Would these patterns hold in a larger, more diverse sample?
Trust & Context
- Key Stat:
- Evidence Grade:
- Longitudinal design with validated measures provides temporal ordering, limited by small sexually diverse subsample and potential for unmeasured confounders.
- Study Age:
- Published 2026 using Quebec longitudinal data from ages 17 to 23.
- Original Title:
- Sexual diversity, adolescent mental health, and adult cannabis use: Longitudinal associations through cannabis use motives.
- Published In:
- Addictive behaviors, 173, 108530 (2026)
- Authors:
- London-Nadeau, Kira(2), Pocuca, Nina(4), Rioux, Charlie, Chadi, Nicholas, Côté, Sylvana M, Fallu, Jean-Sébastien, Geoffroy, Marie-Claude, Huynh, Christophe, Juster, Robert-Paul, Séguin, Jean R, Castellanos-Ryan, Natalie
- Database ID:
- RTHC-08440
Evidence Hierarchy
Frequently Asked Questions
Why are LGBTQ+ youth more vulnerable to cannabis problems?
Depression in adolescence drives cannabis use for coping purposes specifically in sexually diverse youth — creating a pathway from mental health struggles to substance use problems that doesn't operate the same way in heterosexual peers.
Can we prevent cannabis problems in LGBTQ+ youth?
The key finding is that coping motives fully explain the link between depression and cannabis problems, suggesting that building alternative coping skills for sexually diverse adolescents experiencing psychological distress could prevent later substance use issues.
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Cite This Study
https://rethinkthc.com/research/RTHC-08440APA
London-Nadeau, Kira; Pocuca, Nina; Rioux, Charlie; Chadi, Nicholas; Côté, Sylvana M; Fallu, Jean-Sébastien; Geoffroy, Marie-Claude; Huynh, Christophe; Juster, Robert-Paul; Séguin, Jean R; Castellanos-Ryan, Natalie. (2026). Sexual diversity, adolescent mental health, and adult cannabis use: Longitudinal associations through cannabis use motives.. Addictive behaviors, 173, 108530. https://doi.org/10.1016/j.addbeh.2025.108530
MLA
London-Nadeau, Kira, et al. "Sexual diversity, adolescent mental health, and adult cannabis use: Longitudinal associations through cannabis use motives.." Addictive behaviors, 2026. https://doi.org/10.1016/j.addbeh.2025.108530
RethinkTHC
RethinkTHC Research Database. "Sexual diversity, adolescent mental health, and adult cannab..." RTHC-08440. Retrieved from https://rethinkthc.com/research/london-nadeau-2026-sexual-diversity-adolescent-mental
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.