College Students With Stronger Stress Responses Used Cannabis More Frequently
College students whose parasympathetic nervous system reacted more strongly to a challenge task tended to use cannabis more frequently, suggesting physiological stress sensitivity may drive substance use.
Quick Facts
What This Study Found
Among 152 college students, those with larger declines in parasympathetic activity (vagal withdrawal) during a stress challenge task used cannabis more frequently. Unexpectedly, higher resting parasympathetic activity was also associated with more frequent cannabis use. Recovery from the challenge was not related to substance use.
Key Numbers
152 students. Mean age 20.5. 73.8% female. Higher resting RSA linked to more cannabis use. Greater RSA decline (vagal withdrawal) during challenge linked to more frequent use. No association with RSA recovery.
How They Did This
Cross-sectional study of 152 college students (mean age 20.5, 73.8% female) who reported past-month substance use frequency and completed a laboratory stress task (mirror star tracing) while wearing an ECG to measure respiratory sinus arrhythmia (RSA), a marker of parasympathetic nervous system activity.
Why This Research Matters
This study provides biological evidence for the self-medication hypothesis: students whose bodies react more strongly to stress may use cannabis more frequently to cope. Identifying physiological markers of substance use risk could enable earlier, more targeted interventions.
The Bigger Picture
If physiological stress reactivity predicts cannabis use, biofeedback interventions teaching stress regulation could reduce substance use risk. This offers a non-pharmacological, non-stigmatizing prevention approach that addresses the underlying vulnerability rather than just the behavior.
What This Study Doesn't Tell Us
Cross-sectional; cannot determine if stress reactivity causes cannabis use or vice versa. Single laboratory task may not reflect real-world stress responses. Self-reported substance use. Predominantly female sample. Small sample for detecting physiological-behavioral associations.
Questions This Raises
- ?Could biofeedback training reduce cannabis use in physiologically reactive students?
- ?Does chronic cannabis use alter parasympathetic function over time?
- ?Would these findings replicate in more diverse samples?
Trust & Context
- Key Stat:
- Greater stress response linked to more cannabis use
- Evidence Grade:
- Preliminary: novel physiological finding in a small cross-sectional sample requiring replication.
- Study Age:
- 2025 study
- Original Title:
- Substance Use is Associated With College Students' Acute Parasympathetic Nervous System Responses to Challenge.
- Published In:
- Stress and health : journal of the International Society for the Investigation of Stress, 41(1), e70002 (2025)
- Authors:
- Rahal, Danny(2), Kwan, Violet F, Perry, Kristin J(3)
- Database ID:
- RTHC-07426
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Are some people biologically predisposed to using cannabis?
This study found students whose bodies reacted more strongly to stress used cannabis more frequently, suggesting that physiological stress sensitivity may be one biological factor contributing to cannabis use patterns.
Could stress management help reduce cannabis use?
The findings suggest it could. If physiological stress reactivity drives cannabis use as a coping mechanism, interventions like biofeedback that teach stress regulation might reduce the motivation to use.
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Cite This Study
https://rethinkthc.com/research/RTHC-07426APA
Rahal, Danny; Kwan, Violet F; Perry, Kristin J. (2025). Substance Use is Associated With College Students' Acute Parasympathetic Nervous System Responses to Challenge.. Stress and health : journal of the International Society for the Investigation of Stress, 41(1), e70002. https://doi.org/10.1002/smi.70002
MLA
Rahal, Danny, et al. "Substance Use is Associated With College Students' Acute Parasympathetic Nervous System Responses to Challenge.." Stress and health : journal of the International Society for the Investigation of Stress, 2025. https://doi.org/10.1002/smi.70002
RethinkTHC
RethinkTHC Research Database. "Substance Use is Associated With College Students' Acute Par..." RTHC-07426. Retrieved from https://rethinkthc.com/research/rahal-2025-substance-use-is-associated
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.