Cannabis use disorder falls on a spectrum rather than being an all-or-nothing condition
Taxometric analysis of two independent samples confirms that cannabis use disorder has a dimensional structure, meaning it exists on a continuum of severity rather than as a distinct category.
Quick Facts
What This Study Found
Using three taxometric procedures across a large community sample (N=3,623) and a clinical inpatient sample (N=621), cannabis use disorder consistently showed dimensional rather than categorical structure, with mean CCFIs well below the 0.50 threshold for taxonicity.
Key Numbers
Community sample CCFIs: MAMBAC=0.48, MAXEIG=0.30, L-Mode=0.43, mean=0.40. Clinical sample CCFIs: MAMBAC=0.09, MAXEIG=0.21, L-Mode=0.26, mean=0.19. Values below 0.50 indicate dimensional structure.
How They Did This
Three taxometric procedures (MAMBAC, MAXEIG, L-Mode) applied to DSM-5 CUD criteria in the nationally representative NESARC-III community sample and a clinical inpatient substance use treatment sample from Ontario, Canada.
Why This Research Matters
This has direct implications for how cannabis addiction is diagnosed. The findings support the DSM-5 dimensional approach (mild/moderate/severe) over the ICD-11 binary model (dependence yes/no).
The Bigger Picture
The debate over whether addiction is categorical versus dimensional has major implications for treatment, policy, and how individuals understand their own relationship with cannabis. This study adds evidence that problematic cannabis use is better understood as a gradient.
What This Study Doesn't Tell Us
Taxometric methods require specific distributional assumptions. The clinical sample was exclusively from inpatient treatment, representing the more severe end of the spectrum.
Questions This Raises
- ?Should the ICD-11 revise its categorical approach to cannabis dependence based on accumulating dimensional evidence?
- ?How should treatment intensity be calibrated along the severity continuum?
Trust & Context
- Key Stat:
- mean comparison curve fit indices, well below the 0.50 threshold that would indicate a categorical condition
- Evidence Grade:
- Two independent samples with three complementary statistical methods all converging on the same conclusion provides strong evidence.
- Study Age:
- 2025 publication.
- Original Title:
- Taxonicity of cannabis use disorder: Findings from a large community sample and an inpatient clinical sample.
- Published In:
- Journal of psychopathology and clinical science, 134(7), 790-798 (2025)
- Authors:
- Garber, Molly L, Taisir, Radia(3), Costello, Jean(3), MacKillop, James
- Database ID:
- RTHC-06504
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
What does "dimensional" mean in this context?
A dimensional structure means cannabis use disorder exists along a spectrum of severity, like blood pressure or depression, rather than being an all-or-nothing condition.
How does this affect diagnosis?
The DSM-5 already uses a dimensional approach, classifying cannabis use disorder as mild (2-3 symptoms), moderate (4-5), or severe (6+). This study supports that approach over the ICD-11 binary dependence diagnosis.
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Cite This Study
https://rethinkthc.com/research/RTHC-06504APA
Garber, Molly L; Taisir, Radia; Costello, Jean; MacKillop, James. (2025). Taxonicity of cannabis use disorder: Findings from a large community sample and an inpatient clinical sample.. Journal of psychopathology and clinical science, 134(7), 790-798. https://doi.org/10.1037/abn0001031
MLA
Garber, Molly L, et al. "Taxonicity of cannabis use disorder: Findings from a large community sample and an inpatient clinical sample.." Journal of psychopathology and clinical science, 2025. https://doi.org/10.1037/abn0001031
RethinkTHC
RethinkTHC Research Database. "Taxonicity of cannabis use disorder: Findings from a large c..." RTHC-06504. Retrieved from https://rethinkthc.com/research/garber-2025-taxonicity-of-cannabis-use
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.