Cannabis use disorder treatment admissions declined in California after legalization
California saw declining cannabis use disorder treatment admissions after adult-use legalization, even as cannabis problems became more prevalent, with racial disparities in who entered and who left treatment.
Quick Facts
What This Study Found
Legalization was associated with decreased CUD treatment admission probability overall (AME -0.005). Decreases were seen for males, Medi-Cal beneficiaries, adults 21+, and Whites. Increases were seen for criminal justice referrals, Black (AME +0.004), and Hispanic (AME +0.009) patients.
Key Numbers
1,460,066 treatment episodes (2010-2021). Overall AME: -0.005. Males AME: -0.025. Whites AME: -0.012. Criminal justice referrals AME: +0.017. Hispanics AME: +0.009. Blacks AME: +0.004.
How They Did This
Analysis of all publicly funded substance use disorder treatment in California from 2010-2021 (1,460,066 episodes). Individual-level pre-post time series logistic regression with county and year fixed effects.
Why This Research Matters
If legalization reduces treatment-seeking despite increasing cannabis problems, it could signal normalization of problematic use or reduced stigma-driven referrals. The racial disparities in who enters treatment post-legalization raise equity concerns.
The Bigger Picture
The increase in criminal justice referrals for minorities while voluntary treatment seeking declined for others suggests legalization may have differential effects: reducing stigma-based treatment for some while maintaining enforcement-driven treatment for others.
What This Study Doesn't Tell Us
Publicly funded treatment only (misses private treatment). Cannot distinguish voluntary from mandated treatment within non-CJ referrals. Pre-post design cannot prove legalization caused changes. Other policy changes may have occurred simultaneously.
Questions This Raises
- ?Are people with CUD getting help elsewhere (private treatment, harm reduction)?
- ?Does the decline in treatment admissions translate to worse outcomes for people with CUD?
Trust & Context
- Key Stat:
- Treatment declined overall but increased for minorities
- Evidence Grade:
- Large statewide dataset with appropriate time-series methodology, but cannot establish causation and misses private treatment.
- Study Age:
- 2024 analysis of California treatment data from 2010-2021
- Original Title:
- Adult use cannabis legalization and cannabis use disorder treatment in California, 2010-2021.
- Published In:
- Journal of substance use and addiction treatment, 162, 209345 (2024)
- Authors:
- Bass, Brittany(2), Padwa, Howard(2), Khurana, Dhruv(2), Urada, Darren, Boustead, Anne
- Database ID:
- RTHC-05120
Evidence Hierarchy
Frequently Asked Questions
Did cannabis legalization reduce people seeking treatment?
Yes overall. CUD treatment admissions declined in California after adult-use legalization, particularly for White adults, males, and Medi-Cal beneficiaries. However, admissions increased for criminal justice referrals and for Black and Hispanic patients.
Why might legalization reduce treatment seeking?
Possible explanations include reduced stigma around cannabis use, normalization of use making problems seem less serious, fewer legal consequences that previously motivated treatment, or people accessing support through non-traditional channels.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-05120APA
Bass, Brittany; Padwa, Howard; Khurana, Dhruv; Urada, Darren; Boustead, Anne. (2024). Adult use cannabis legalization and cannabis use disorder treatment in California, 2010-2021.. Journal of substance use and addiction treatment, 162, 209345. https://doi.org/10.1016/j.josat.2024.209345
MLA
Bass, Brittany, et al. "Adult use cannabis legalization and cannabis use disorder treatment in California, 2010-2021.." Journal of substance use and addiction treatment, 2024. https://doi.org/10.1016/j.josat.2024.209345
RethinkTHC
RethinkTHC Research Database. "Adult use cannabis legalization and cannabis use disorder tr..." RTHC-05120. Retrieved from https://rethinkthc.com/research/bass-2024-adult-use-cannabis-legalization
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.