Recreational Drug Users Had More Difficulty Recalling Personal Memories
People who used substances recreationally (including cannabis, MDMA, and cocaine) recalled significantly fewer specific personal memories and were more likely to fail to retrieve a memory within the time limit.
Quick Facts
What This Study Found
Participants who reported recreational substance use recalled significantly fewer specific autobiographical memories than non-users and were more likely to omit responses entirely. These differences remained significant after controlling for general health, sleep, alcohol use, and age.
Key Numbers
100 participants: 53 substance users, 47 non-users. Substance users recalled significantly fewer specific personal event memories and had more omissions within the time limit. Results held after controlling for general health, sleep routine, alcohol use, and age.
How They Did This
Lab-based study comparing 53 recreational substance users (including cannabis, MDMA, cocaine) with 47 non-users, ages 18-55. All completed self-report questionnaires and a standardized autobiographical memory test. Results were adjusted for covariates.
Why This Research Matters
Most research on substance use and memory focuses on people with diagnosed dependence. This study examined recreational users, suggesting that even occasional use may affect the ability to recall specific personal experiences.
The Bigger Picture
Autobiographical memory is central to personal identity, decision-making, and social functioning. If even recreational substance use can impair it, this has implications for the large number of people who use substances occasionally without considering cognitive effects.
What This Study Doesn't Tell Us
Cross-sectional design prevents determining whether memory differences preceded or followed substance use. The substance user group included multiple drugs, making it difficult to isolate cannabis-specific effects. Relatively small sample size.
Questions This Raises
- ?Which specific substances drive the memory impairment most strongly?
- ?Are these effects reversible with cessation?
- ?Do different patterns of use (frequency, duration) produce different memory effects?
Trust & Context
- Key Stat:
- Recreational users recalled fewer specific memories and had more retrieval failures, even after adjusting for sleep and health
- Evidence Grade:
- Preliminary: small cross-sectional study that cannot isolate cannabis-specific effects or determine causation.
- Study Age:
- 2025 study.
- Original Title:
- Recreational substance use is linked with difficulty in recalling personal experiences.
- Published In:
- Scientific reports, 15(1), 34492 (2025)
- Authors:
- Levent, Adnan, Davelaar, Eddy J
- Database ID:
- RTHC-06927
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Was this study specifically about cannabis?
No. The substance user group included people who used cannabis, MDMA, cocaine, and other drugs recreationally, so the effects cannot be attributed to any single substance.
Could other factors explain the memory differences?
Researchers controlled for general health, sleep, alcohol use, and age, and the differences remained significant, though unmeasured factors could still play a role.
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Cite This Study
https://rethinkthc.com/research/RTHC-06927APA
Levent, Adnan; Davelaar, Eddy J. (2025). Recreational substance use is linked with difficulty in recalling personal experiences.. Scientific reports, 15(1), 34492. https://doi.org/10.1038/s41598-025-13800-y
MLA
Levent, Adnan, et al. "Recreational substance use is linked with difficulty in recalling personal experiences.." Scientific reports, 2025. https://doi.org/10.1038/s41598-025-13800-y
RethinkTHC
RethinkTHC Research Database. "Recreational substance use is linked with difficulty in reca..." RTHC-06927. Retrieved from https://rethinkthc.com/research/levent-2025-recreational-substance-use-is
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.