An fMRI study found that young adults at risk for cannabis use disorder showed heightened brain activation in reward regions when exposed to cannabis-related odor cues.
Addiction neuroscientists, clinical researchers, and those interested in cannabis use disorder biomarkers.
Higher CUD risk linked to greater ventral striatum activation to cannabis odors
What the researchers found
Using fMRI, researchers found that young adults with higher cannabis use disorder risk showed greater activation in the ventral striatum and orbitofrontal cortex when exposed to cannabis odor cues compared to neutral odors. This pattern mirrors cue-reactivity findings seen in other substance use disorders.
Why it matters
Understanding how cannabis cues activate the brain in at-risk users could help identify who is most vulnerable to developing problematic use and inform cue-exposure based treatments.
The numbers in context
54 participants; heightened activation in ventral striatum and orbitofrontal cortex to cannabis odor cues in higher-risk individuals.
How the study worked
Cross-sectional fMRI study with 54 young adult cannabis users exposed to cannabis-related and neutral odor cues during brain scanning. CUD risk was assessed using validated screening tools.
What this study cannot tell us
Cross-sectional design cannot determine whether heightened cue-reactivity causes or results from heavier use. Moderate sample size. Odor cues may not capture the full range of real-world cannabis triggers.
How to read the evidence
Preliminary: cross-sectional fMRI with moderate sample size; cannot establish directionality.
When this study was published
Published 2020.
The bigger picture
Cue-reactivity (strong brain responses to substance-related cues) is a hallmark of addiction neuroscience. Finding this pattern for cannabis odor cues suggests that problematic cannabis use shares neural mechanisms with other substance use disorders.
Questions still open
- Could cue-reactivity fMRI serve as a biomarker for CUD risk? Would cue-exposure therapy reduce this heightened reactivity over time?
Common questions
What brain regions responded to cannabis odor cues?
Does this mean cannabis is addictive in the same way as other drugs?
Read the original research
FMRI activation to cannabis odor cues is altered in individuals at risk for a cannabis use disorder.
Brain and behavior, 10(10), e01764
Citation
Kleinhans, Natalia M; Sweigert, Julia; Blake, Matthew; Douglass, Bradley; Doane, Braden; Reitz, Fredrick; Larimer, Mary. (2020). FMRI activation to cannabis odor cues is altered in individuals at risk for a cannabis use disorder.. Brain and behavior, 10(10), e01764. https://doi.org/10.1002/brb3.1764
Explore the wider topic
- Physical vs Psychological Cannabis Dependence: What Science Actually Shows
- The Gap Between Cannabis Perception and Science: Why What We Believe Outpaces What We Know
- Cannabis Use Disorder: Am I Addicted? Self-Assessment Guide
- Cross-Addiction After Quitting Weed: When One Habit Replaces Another
- Is Weed Addictive? What the Research Actually Shows
- Is Cannabis Addictive? What the DSM-5 and Brain Science Say
- Quitting Weed and Alcohol Together: What to Know About Dual Cessation
- Is Rehab Necessary for Weed? An Honest Assessment
- Signs You May Have Cannabis Use Disorder: An Honest Self-Assessment
- Weed Vape Pen Addiction: Why Vaping Makes It Harder to Quit