Can cannabis help people reduce opioid use? Researchers are studying that question, but current evidence does not establish cannabis as a dependable substitute for prescribed opioids or as a treatment for opioid use disorder. Pain relief, a lower opioid dose, and recovery from addiction are different outcomes and should not be treated as interchangeable.
Editorial update, October 9, 2026: This article replaces earlier claims that overstated cannabis’s role in preventing opioid deaths and treating addiction.
What research says about cannabis and opioid use
Some people report reducing their opioid medication after starting medical cannabis. Those experiences deserve investigation, but a survey or observational study cannot establish that cannabis caused the reduction or that the same approach will be safe for someone else.
A 2022 systematic review by Nielsen and colleagues found promising results in animal and observational research, while higher-quality randomized trials did not establish an opioid-sparing effect. A review published in 2024, covering 15 studies, also concluded that this effect remains uncertain.
“Opioid-sparing” means maintaining pain control while using less opioid medication. It does not mean that cannabis has been shown to treat addiction, prevent overdose, or make unsupervised withdrawal safe.
Do medical cannabis laws reduce overdose deaths?
The population-level evidence is inconsistent. NCCIH’s evidence summary describes an early analysis linking medical cannabis laws with lower opioid overdose mortality. When researchers extended the analysis through 2017, the association reversed.
That does not prove cannabis caused either outcome. A comparison between states cannot tell us what happened to an individual who used cannabis. The earlier version of this article presented a reduction in deaths too confidently; that claim should not guide anyone’s treatment decisions.
Pain treatment and addiction treatment need different plans
Cannabis research suggests modest benefits for some chronic pain conditions, alongside side effects. A possible improvement in pain does not establish a treatment for opioid use disorder. Cannabis can also cause impairment, and some users develop cannabis use disorder. CBD can interact with medications. These limitations are covered in NCCIH’s cannabis and cannabinoid guidance.
The FDA identifies three approved medications for opioid use disorder: buprenorphine, methadone, and naltrexone. Cannabis is not one of them. A qualified clinician can help determine the appropriate treatment and support for the individual.
Talk with your clinician before changing medication
Do not stop or reduce prescribed opioids on your own in order to try cannabis. CDC guidance calls for shared decisions and careful assessment of benefits and risks. Except for life-threatening circumstances, it advises against abruptly stopping opioids or rapidly reducing higher doses.
Bring your full medication list, including cannabis and CBD products, to the appointment. Useful questions include:
- What is causing my pain, and which treatments have evidence for that condition?
- Could cannabis or CBD interact with any medication I take?
- If a medication change is appropriate, how will we monitor pain, function, and side effects?
- Should I have naloxone available, and does my household know how to use it?
Where to find help
For treatment referrals in the United States, use SAMHSA’s treatment resources or call 1-800-662-HELP (4357). The helpline offers free, confidential information and referrals around the clock.
If you suspect an opioid overdose, give naloxone if available and call 911 immediately. Stay with the person until emergency help arrives. CDC’s naloxone guidance explains how this medicine can reverse an opioid overdose. Cannabis is not an overdose rescue treatment.
This article provides general education and does not replace individualized medical advice.
