A meta-analysis of 10 studies with 8,367 participants found no significant association between cannabis use and return to non-medical opioid use during opioid use disorder treatment.
People interested in opioid use disorder treatment, harm reduction, and cannabis policy in addiction medicine.
OR 1.00: cannabis had zero association with opioid relapse during treatment
What the researchers found
The pooled odds ratio was 1.00 (95% CI: 0.97-1.04, p=.98), indicating no association between cannabis use and non-medical opioid use during OUD treatment. This null finding held across treatment types (methadone, buprenorphine, naltrexone). Average follow-up was 9.7 months.
Why it matters
Some treatment programs require cannabis abstinence for opioid use disorder medication. This meta-analysis found no evidence that cannabis use worsens opioid treatment outcomes, challenging the rationale for mandatory cannabis abstinence policies.
The numbers in context
10 studies, 8,367 participants. 38% female. Pooled OR: 1.00 (95% CI: 0.97-1.04). Average follow-up: 9.7 months. Treatment: methadone 76.3%, buprenorphine 21.3%, naltrexone 2.4%. Moderate heterogeneity.
How the study worked
Systematic review and meta-analysis of 10 longitudinal studies found across multiple databases. Random-effects model with restricted maximum likelihood. Sensitivity analysis by OUD treatment modality. 8,367 participants (38% female), mostly receiving methadone (76.3%).
What this study cannot tell us
Moderate heterogeneity and evidence of publication bias. Mostly methadone patients (76.3%), limiting generalizability to other medications. Cannot distinguish between different cannabis use patterns (frequency, quantity, method). Does not assess cannabis for OUD treatment, only concurrent use.
How to read the evidence
High-quality meta-analysis of longitudinal studies with large pooled sample. Limited by moderate heterogeneity, publication bias, and heavy methadone representation.
When this study was published
Published in 2024 in the American Journal of Drug and Alcohol Abuse, searching through April 2023.
The bigger picture
The question of whether cannabis helps or hinders opioid recovery is politically charged. This meta-analysis provides the most definitive answer yet: neither. This supports individualized approaches rather than blanket policies requiring cannabis abstinence for OUD treatment.
Questions still open
- Should cannabis abstinence requirements be removed from OUD treatment programs? Would heavy versus occasional cannabis use show different associations? Could certain cannabis use patterns actually improve OUD treatment adherence through stress reduction?
Common questions
Does cannabis use interfere with opioid addiction treatment?
Should opioid treatment programs require cannabis abstinence?
Read the original research
The impact of cannabis on non-medical opioid use among individuals receiving pharmacotherapies for opioid use disorder: a systematic review and meta-analysis of longitudinal studies.
The American journal of drug and alcohol abuse, 50(1), 12-26
Citation
Costa, Gabriel P A; Nunes, Julio C; Heringer, Daniel L; Anand, Akhil; De Aquino, Joao P. (2024). The impact of cannabis on non-medical opioid use among individuals receiving pharmacotherapies for opioid use disorder: a systematic review and meta-analysis of longitudinal studies.. The American journal of drug and alcohol abuse, 50(1), 12-26. https://doi.org/10.1080/00952990.2023.2287406
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