What people expect from cannabis influences how much it reduces their anxiety and pain
Cannabis users who expected stronger health benefits experienced greater acute reductions in tension and pain after using legal market products, suggesting expectancy effects shape cannabis outcomes.
Quick Facts
What This Study Found
More positive health expectancies correlated with greater tension reduction in both flower and edible users; edible users with stronger expectancies also showed greater elation increases and pain reductions; domain-specific expectancies predicted corresponding outcomes.
Key Numbers
55 flower users, 101 edible users; products varied in CBD/THC content; expectancy effects consistent across both flower and edible groups for tension reduction; edible users showed additional expectancy effects on elation and pain.
How They Did This
Two quasi-experimental studies; 55 flower and 101 edible users randomly assigned to products with varying CBD/THC; baseline expectancies measured; acute tension, elation, and pain assessed after naturalistic self-administration.
Why This Research Matters
If expectancy effects substantially influence cannabis outcomes, this complicates interpreting both clinical trials and self-reported therapeutic benefits.
The Bigger Picture
Expectancy effects are well-established for alcohol and pharmaceuticals, and this study extends that understanding to cannabis, suggesting beliefs may matter as much as pharmacology for some outcomes.
What This Study Doesn't Tell Us
Naturalistic administration limits dose precision; expectancies measured before but not blinded; cannot fully separate pharmacological from expectancy effects; acute effects only; relatively small samples.
Questions This Raises
- ?How much of reported therapeutic cannabis benefit is pharmacological versus expectancy-driven?
- ?Could clinicians use expectancy management to improve outcomes?
Trust & Context
- Key Stat:
- Expectancy effects predicted tension, elation, and pain outcomes beyond pharmacological factors
- Evidence Grade:
- Randomized product assignment provides some experimental rigor, but inability to blind expectancies and naturalistic administration limit causal conclusions.
- Study Age:
- Published 2025
- Original Title:
- Investigating the Relationship Between Cannabis Expectancies and Anxiety, Depression, and Pain Responses After Acute Flower and Edible Cannabis Use.
- Published In:
- Cannabis and cannabinoid research, 10(1), 71-80 (2025)
- Authors:
- Chen, Margy Y(2), Kramer, Emily B, Gibson, Laurel P(5), Bidwell, L Cinnamon, Hutchison, Kent E, Bryan, Angela D
- Database ID:
- RTHC-06202
Evidence Hierarchy
Participants are randomly assigned to treatment or placebo groups to test cause and effect.
What do these levels mean? →Frequently Asked Questions
Do expectations about cannabis matter?
Yes. People who expected cannabis to improve their health experienced greater reductions in tension (both flower and edible users) and greater pain relief and mood improvement (edible users).
Was this just placebo effect?
Not exactly. All participants received active cannabis. The finding shows that among active users, pre-existing beliefs modulate how strongly people respond, suggesting a combined pharmacological and psychological effect.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-06202APA
Chen, Margy Y; Kramer, Emily B; Gibson, Laurel P; Bidwell, L Cinnamon; Hutchison, Kent E; Bryan, Angela D. (2025). Investigating the Relationship Between Cannabis Expectancies and Anxiety, Depression, and Pain Responses After Acute Flower and Edible Cannabis Use.. Cannabis and cannabinoid research, 10(1), 71-80. https://doi.org/10.1089/can.2023.0264
MLA
Chen, Margy Y, et al. "Investigating the Relationship Between Cannabis Expectancies and Anxiety, Depression, and Pain Responses After Acute Flower and Edible Cannabis Use.." Cannabis and cannabinoid research, 2025. https://doi.org/10.1089/can.2023.0264
RethinkTHC
RethinkTHC Research Database. "Investigating the Relationship Between Cannabis Expectancies..." RTHC-06202. Retrieved from https://rethinkthc.com/research/chen-2025-investigating-the-relationship-between
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.