Higher Working Memory May Help Cannabis Reduce Alcohol Cravings
In a controlled trial, people with higher working memory capacity experienced reduced alcohol urge after smoking high-potency cannabis, while those with lower working memory did not — suggesting cognitive factors shape who benefits from cannabis as an alcohol substitute.
Quick Facts
What This Study Found
Participants with higher working memory (symmetry span task) reported significantly lower alcohol urge after smoking 7.2% THC cannabis vs. placebo, but this effect was not seen at 3.1% THC or among those with lower working memory capacity.
Key Numbers
N=125 (32% female); 3 sessions: placebo, 3.1% THC, 7.2% THC; significant urge reduction only at 7.2% THC for high-WMC individuals (symmetry span); n-back associated with overall urge but did not moderate cannabis effects
How They Did This
Randomized placebo-controlled crossover trial with 125 adults (ages 21-44) who were heavy alcohol users and frequent cannabis users, completing three sessions smoking placebo, 3.1% THC, and 7.2% THC cannabis, with pre/post alcohol urge ratings and working memory assessments.
Why This Research Matters
As more people consider using cannabis to reduce drinking, this study reveals that the benefit may depend on cognitive capacity — those with lower working memory may be less likely to experience reduced alcohol cravings from cannabis.
The Bigger Picture
Individual differences in cognitive functioning may explain why cannabis substitution for alcohol works for some people but not others, pointing toward personalized approaches in harm reduction.
What This Study Doesn't Tell Us
Laboratory setting may not reflect real-world use; relatively low THC potency by current standards; dual-user sample limits generalizability; working memory measures showed inconsistent results across tasks; acute effects only.
Questions This Raises
- ?Would higher-potency THC show effects across all working memory levels?
- ?Does this cognitive moderation apply to other substance cravings?
- ?Could working memory training enhance cannabis's alcohol-reduction benefits?
Trust & Context
- Key Stat:
- Evidence Grade:
- Well-designed randomized crossover trial with within-subject comparisons, though limited by laboratory setting and relatively low THC concentrations.
- Study Age:
- Published 2026; uses controlled cannabis administration protocols.
- Original Title:
- Working memory capacity predicts cannabis-induced effects on alcohol urge.
- Published In:
- Addictive behaviors, 174, 108565 (2026)
- Authors:
- Gunn, Rachel L(9), Howe, Lindy K(4), Boyle, Holly K(2), Metrik, Jane
- Database ID:
- RTHC-08301
Evidence Hierarchy
Frequently Asked Questions
Can cannabis help reduce alcohol cravings?
It depends on the person — this study found that cannabis reduced alcohol urge only in people with higher working memory capacity, suggesting individual cognitive differences shape whether cannabis substitution works.
Why does working memory matter for cannabis and alcohol use?
Working memory helps regulate impulses and redirect attention. People with higher working memory may be better able to redirect their focus away from alcohol cravings when using cannabis.
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Cite This Study
https://rethinkthc.com/research/RTHC-08301APA
Gunn, Rachel L; Howe, Lindy K; Boyle, Holly K; Metrik, Jane. (2026). Working memory capacity predicts cannabis-induced effects on alcohol urge.. Addictive behaviors, 174, 108565. https://doi.org/10.1016/j.addbeh.2025.108565
MLA
Gunn, Rachel L, et al. "Working memory capacity predicts cannabis-induced effects on alcohol urge.." Addictive behaviors, 2026. https://doi.org/10.1016/j.addbeh.2025.108565
RethinkTHC
RethinkTHC Research Database. "Working memory capacity predicts cannabis-induced effects on..." RTHC-08301. Retrieved from https://rethinkthc.com/research/gunn-2026-working-memory-capacity-predicts
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.