The Genetics of Trying Cannabis Are Different from the Genetics of Cannabis Addiction
A massive genetic study found 11 gene variants linked to ever trying cannabis — prominently CADM2 — and showed the genetics of trying cannabis overlap with risk-taking and openness but differ from cannabis addiction genetics.
Quick Facts
What This Study Found
11 independent genome-wide significant variants for cannabis lifetime use, most prominently CADM2*rs7609594 (p=7.4×10⁻²⁰); genetic correlations with risk-taking, openness, and substance use; bidirectional causal relationships via Mendelian randomization; distinct from CUD genetic architecture.
Key Numbers
258,823 effective sample; 11 significant variants; CADM2*rs7609594 p=7.4×10⁻²⁰; bidirectional MR causality with risk-taking and sexual behaviors; 6 traits locally correlated with CanLU at CADM2.
How They Did This
Multi-ancestral GWAS using All of Us data meta-analyzed with prior studies (effective N=258,823), followed by genetic correlation (LDSC), local genetic correlation (LAVA), Mendelian randomization, and phenome-wide association analysis.
Why This Research Matters
The genetic distinction between trying cannabis and developing addiction is crucial — it means different people need different prevention approaches, and trying cannabis alone isn't a genetic pathway to addiction.
The Bigger Picture
CADM2's central role links cannabis experimentation to a broader biology of exploration and risk-taking — suggesting that cannabis 'gateway' effects may be driven by shared genetics of novelty-seeking rather than pharmacological progression.
What This Study Doesn't Tell Us
Lifetime use is a binary measure missing frequency and quantity; multi-ancestral meta-analysis still dominated by European ancestry; GWAS associations are not actionable individual predictions; MR assumptions may be violated.
Questions This Raises
- ?Could CADM2-based risk stratification identify youth needing targeted prevention?
- ?How do CUD-specific genetic variants differ from CanLU variants mechanistically?
Trust & Context
- Key Stat:
- Evidence Grade:
- Large multi-ancestral GWAS with robust post-hoc analyses including Mendelian randomization, published in a top neuropsychopharmacology journal.
- Study Age:
- Published in 2026 using All of Us and other cohorts, providing the most comprehensive genetic analysis of cannabis lifetime use to date.
- Original Title:
- The genetics of cannabis lifetime use.
- Published In:
- Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 51(3), 554-564 (2026)
- Authors:
- Bright, Uri, Beck, Sarah, Galimberti, Marco(2), Gupta, Priya, Chen, Yu, Dao, Cecilia, Nunez, Yaira Z, Kranzler, Henry R, Zhou, Yu, Zhang, Yingzhe, Choi, Karmel W, Levey, Daniel F, Gelernter, Joel
- Database ID:
- RTHC-08137
Evidence Hierarchy
Frequently Asked Questions
Is trying cannabis genetic?
Partly — this study found 11 gene variants associated with ever trying cannabis, most prominently in the CADM2 gene, which is also linked to risk-taking and openness to experience.
Are the genetics of trying cannabis the same as cannabis addiction?
No — this study found the genetic architecture of cannabis experimentation is distinct from cannabis use disorder, suggesting different biological pathways for trying versus becoming addicted.
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Cite This Study
https://rethinkthc.com/research/RTHC-08137APA
Bright, Uri; Beck, Sarah; Galimberti, Marco; Gupta, Priya; Chen, Yu; Dao, Cecilia; Nunez, Yaira Z; Kranzler, Henry R; Zhou, Yu; Zhang, Yingzhe; Choi, Karmel W; Levey, Daniel F; Gelernter, Joel. (2026). The genetics of cannabis lifetime use.. Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 51(3), 554-564. https://doi.org/10.1038/s41386-025-02255-4
MLA
Bright, Uri, et al. "The genetics of cannabis lifetime use.." Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 2026. https://doi.org/10.1038/s41386-025-02255-4
RethinkTHC
RethinkTHC Research Database. "The genetics of cannabis lifetime use." RTHC-08137. Retrieved from https://rethinkthc.com/research/bright-2026-the-genetics-of-cannabis
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.