Arizona saw a significant increase in cannabis-related hospital visits from 2016 to 2021, spanning the period before and after recreational legalization.
Public health officials, legalization policy analysts, emergency medicine providers
Cannabis-related hospitalizations increased in Arizona from 2016 to 2021
What the researchers found
Cannabis-related hospitalizations in Arizona increased notably over a six-year period that included the transition from medical-only to recreational cannabis legalization.
Why it matters
Tracking hospitalization trends helps quantify the health system impact of cannabis legalization and informs resource planning for emergency departments and public health agencies.
The numbers in context
Analysis covered Arizona hospital data from 2016 to 2021; specific rates and trends in full text.
How the study worked
Retrospective analysis of hospital discharge data in Arizona from 2016 to 2021, tracking cannabis-related diagnoses over time.
What this study cannot tell us
Hospital coding changes over time may inflate apparent trends. Cannot distinguish between increased use, increased potency, and changes in reporting. Ecological design limits individual-level inference.
How to read the evidence
Large administrative dataset provides trend data but cannot control for coding changes or establish causation with legalization.
When this study was published
2025 study analyzing 2016-2021 hospital data in Arizona.
The bigger picture
Multiple states have reported increases in cannabis-related emergency visits following legalization. Whether this reflects more use, higher-potency products, better diagnostic coding, or reduced stigma around reporting remains debated.
Questions still open
- How much of the increase reflects actual health harms versus changes in coding and reporting? Which specific cannabis products or use patterns drive hospitalizations?
Common questions
Did cannabis hospitalizations go up after legalization in Arizona?
What causes cannabis-related hospitalizations?
Read the original research
Trends in Cannabis-Related Hospitalizations in Arizona From 2016 to 2021 and Associations With Mental Health-Related Hospitalizations.
Journal of studies on alcohol and drugs, 86(3), 436-445
Citation
Meier, Madeline H; Hummel, Haley M; Miller, Matt L. (2025). Trends in Cannabis-Related Hospitalizations in Arizona From 2016 to 2021 and Associations With Mental Health-Related Hospitalizations.. Journal of studies on alcohol and drugs, 86(3), 436-445. https://doi.org/10.15288/jsad.23-00379
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