What topics does this cannabis study cover?

This study covers research on: THC, Mental Health.

Cannabis may feel calming while raising some stress signals

Q: What did this research study find?

**Stress ratings decreased across all groups**, including placebo, indicating that perceived relief may reflect expectancy effects rather than a specific *THC* effect.

Q: Where was this research published?

Published in Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology on August 22, 2026.

Multimodal examination of the acute effects of cannabis on subjective and physiological stress-related outcomes: a randomized placebo-controlled laboratory study.

Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology • August 22, 2026 • Highly Relevant

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AI Summary

In a randomized, double-blind, placebo-controlled laboratory study, 120 regular cannabis users vaped either placebo, 20 mg THC, or 40 mg THC. Researchers measured participants’ perceived stress, cortisol, skin conductance, heart activity, and heart-rate variability before vaping and during the following hour. Stress ratings fell in all groups, suggesting that expectations or the study setting—not cannabis itself—may have driven the reported feeling of reduced stress.

Cannabis produced a mixed physiological pattern rather than uniformly calming the body. The high dose caused a larger early drop in cortisol, while both cannabis doses reduced some electrodermal stress responses. At the same time, the high dose increased heart rate and later increased some skin-conductance activity; cannabis did not affect heart-rate variability. Overall, subjective stress relief was similar to placebo, while cannabis simultaneously dampened some stress systems and increased cardiovascular arousal. For users, this suggests that feeling calmer after cannabis does not necessarily mean the body is experiencing less stress.

💡 Key Findings

Stress ratings decreased across all groups, including placebo, indicating that perceived relief may reflect expectancy effects rather than a specific THC effect.

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The high THC dose produced a larger early decrease in salivary cortisol than the other conditions, while cortisol later increased in both cannabis groups.

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Cannabis reduced some electrodermal stress responses, but the high dose also increased heart rate and later increased peaks in skin conductance, showing divergent effects across stress systems.

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No cannabis effect on heart-rate variability was detected, indicating that not all measured stress-related physiological systems changed with acute cannabis use.

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The study concludes that common perceptions of cannabis-related stress relief do not reflect uniform suppression of stress responses.

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📄 Original Abstract

People who use cannabis commonly report stress-relieving effects, yet no studies have simultaneously assessed the acute effects of cannabis on multiple stress systems under placebo-controlled conditions. We conducted a randomized, double-blind, placebo-controlled trial in which 120 people (56 men, 52 women, 12 non-binary/transgender) who regularly use cannabis were assigned to vape placebo, a moderate dose (20 mg Δ9-tetrahydrocannabinol [THC]), or a high dose (40 mg THC) of cannabis. Stress ratings and salivary cortisol samples were obtained before (T0), 5 minutes (T1), and 60 minutes (T2) after vaping. Participants wore an Embrace wristband continuously measuring electrodermal activity (EDA), heart rate (HR), and heart rate variability (HRV). Stress ratings decreased across all conditions from T0 to T1 (p = 0.01) and T2 (p < 0.001), suggesting expectancy effects rather than cannabis effects. Salivary cortisol concentration decreased from T0 to T1 across all conditions (p < 0.001), with a significantly larger decrease in the high-dose condition (p = 0.03), followed by an increase from T1 to T2 in both cannabis conditions (p = 0.001). Skin conductance response amplitude and area under the curve decreased in both cannabis conditions (p's < 0.01), whereas peaks-per-minute increased in the high-dose condition at T2 (p = 0.01). HR was elevated significantly more in the high-dose than placebo condition during vaping (p = 0.001) and at T1 (p = 0.02). No effects of cannabis on HRV were detected. These findings indicate that cannabis intoxication divergently modulates stress physiology, attenuating neuroendocrine and electrodermal responses while elevating cardiovascular arousal and producing subjective stress reductions comparable to placebo. Thus, common perceptions of stress relief do not reflect uniform suppression of stress-related outcomes. This has important implications for the widespread use of cannabis as a coping strategy.

Paper Type

📄 Research

Publication

Journal: Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology
Published: August 22, 2026
PMID: 42632818
DOI: 10.1038/s41386-026-02533-9

Authors (7)

Carrie Cuttler Departments of Psychology, Washington State University, Pullman, WA, USA. carrie.cuttler@wsu.edu.
Matteya A Proctor Integrative Physiology and Neuroscience, Washington State University, Pullman, WA, USA.
Nicholas C Glodosky Departments of Psychology, Washington State University, Pullman, WA, USA.
Reza Rahimi Azghan College of Health Solutions, Arizona State University, Phoenix, AZ, USA.
Zachary D G Fisher Integrative Physiology and Neuroscience, Washington State University, Pullman, WA, USA.
+2 more authors