Bad Mood Made People Report More Cannabis Problems Even When Their Use Had Not Changed
In an experiment with over 700 participants, those randomly assigned to a negative mood induction reported more cannabis-related problems and more negative cannabis expectancies than controls, even though actual use did not differ.
Quick Facts
What This Study Found
Participants assigned to the negative affect induction reported significantly greater negative cannabis expectancies and more cannabis problems compared to the control group, after controlling for age and education. This suggests that current mood state can bias self-reports of substance use outcomes, which has implications for research and clinical assessment.
Key Numbers
700+ participants; negative affect induction significantly increased reported cannabis problems; significantly increased negative cannabis expectancies; actual cannabis use was not different between groups
How They Did This
Randomized experimental study of over 700 participants recruited from Amazon MTurk. After baseline affect and demographics, participants were randomly assigned to a negative affect induction or control condition. Post-induction measures assessed affect state and cannabis-related variables.
Why This Research Matters
Most cannabis research and clinical assessments rely on self-reported problems. If being in a bad mood inflates reports of cannabis problems, then study findings and clinical evaluations conducted when patients are distressed may overestimate the harms of cannabis use.
The Bigger Picture
This finding could have wide-ranging implications for cannabis research methodology. If mood state biases reporting, then studies that assess participants during stressful times (clinic visits, withdrawal periods) may systematically overestimate cannabis-related problems.
What This Study Doesn't Tell Us
Online sample from MTurk may not represent clinical populations. The mood induction was brief and artificial. Cannot determine whether mood bias affects all types of self-reported substance measures equally. Did not test whether positive mood produces opposite bias.
Questions This Raises
- ?Should cannabis researchers control for current mood state when collecting self-reports?
- ?Does this bias affect reports for other substances similarly?
- ?Would mood-neutral assessment protocols produce different prevalence estimates for cannabis problems?
Trust & Context
- Key Stat:
- Mood biased problem reporting
- Evidence Grade:
- Randomized experimental design with large sample, but online MTurk participants may not represent clinical populations
- Study Age:
- 2023 study
- Original Title:
- Induced negative affect's impact on self-reported cannabis use, expectancies, and problems.
- Published In:
- Addictive behaviors, 141, 107652 (2023)
- Authors:
- Altman, Brianna R, Earleywine, Mitch(2)
- Database ID:
- RTHC-04367
Evidence Hierarchy
Participants are randomly assigned to treatment or placebo groups to test cause and effect.
What do these levels mean? →Frequently Asked Questions
Can your mood affect how you perceive your cannabis use?
Yes. This study found that people in a bad mood reported more cannabis-related problems than those in a neutral mood, even when their actual use patterns were the same. Current emotional state appears to color self-assessment.
What does this mean for cannabis research?
It suggests that self-reported cannabis problems may be inflated when participants are assessed during periods of negative mood, which could bias study conclusions about how harmful cannabis use is.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-04367APA
Altman, Brianna R; Earleywine, Mitch. (2023). Induced negative affect's impact on self-reported cannabis use, expectancies, and problems.. Addictive behaviors, 141, 107652. https://doi.org/10.1016/j.addbeh.2023.107652
MLA
Altman, Brianna R, et al. "Induced negative affect's impact on self-reported cannabis use, expectancies, and problems.." Addictive behaviors, 2023. https://doi.org/10.1016/j.addbeh.2023.107652
RethinkTHC
RethinkTHC Research Database. "Induced negative affect's impact on self-reported cannabis u..." RTHC-04367. Retrieved from https://rethinkthc.com/research/altman-2023-induced-negative-affects-impact
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.