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.

Bass, Brittany et al.·Journal of substance use and addiction treatment·2024·Moderate Evidencepre-post time series
RTHC-05120Pre Post time seriesModerate Evidence2024RETHINKTHC RESEARCH DATABASErethinkthc.com/research

Quick Facts

Study Type
pre-post time series
Evidence
Moderate Evidence
Sample
Not reported

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)
Database ID:
RTHC-05120

Evidence Hierarchy

Meta-Analysis / Systematic Review
Randomized Controlled Trial
Cohort / Case-Control
Cross-Sectional / ObservationalSnapshot without intervening
This study
Case Report / Animal Study
What do these levels mean? →

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

RTHC-05120·https://rethinkthc.com/research/RTHC-05120

APA

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.