Marijuana and Opioids: Can Cannabis Reduce Opioid Use? (2026)

By James Buddsey · Updated October 16, 2026

Current research does not show that marijuana reduces opioid use or opioid overdose deaths. An early study found lower opioid death rates in medical cannabis states, but that link reversed when the data were extended, and clinical trials have not shown that adding cannabis lets pain patients cut their opioid doses. Cannabis does have substantial evidence for modest relief of chronic pain, and CBD is being studied for opioid cravings, but proven medications remain the treatment for opioid addiction.

When this article was first written, many people hoped legal cannabis would help end the opioid crisis. The idea made sense: cannabis cannot cause a fatal overdose, and chronic pain is the leading reason people get medical cards. Since then, researchers have tested the idea in several ways. This guide explains what they found, as of October 2026, and where cannabis may still have a role.

Marijuana and Opioids: Evidence at a Glance

The Opioid Crisis in 2026

The epidemic came in waves: prescription painkillers such as OxyContin, which Purdue Pharma marketed aggressively beginning in the late 1990s, then heroin, then illicitly made fentanyl, a synthetic opioid far stronger than heroin. Fentanyl now drives most deaths.

There is some good news. According to the CDC’s provisional data, U.S. drug overdose deaths fell from about 108,000 in 2022 to about 81,000 in 2024, with roughly 55,000 involving opioids, and to about 66,500 in the 12 months ending May 2026. Researchers are still sorting out the causes. Cannabis legalization has not been shown to be one of them, as the research below explains. Final 2022 and 2023 counts are on NIDA’s overdose page.

Why People Hoped Cannabis Could Help

• No fatal overdose. The National Cancer Institute explains that cannabinoid receptors are not located in the brainstem areas that control breathing, so cannabis does not cause the respiratory depression that kills people in opioid overdoses.
• Pain relief. The National Academies’ 2017 review found substantial evidence that cannabis is effective for chronic pain in adults. If patients could swap some opioids for cannabis, fewer would be exposed to opioid risks.
• Surveys. Many medical cannabis patients report using fewer painkillers. Surveys like these cannot confirm that, because they rely on memory and include only people who chose to keep using cannabis.

Do Medical Marijuana Laws Reduce Opioid Deaths?

The study that launched the idea was published in JAMA Internal Medicine in 2014. Looking at state death data from 1999 to 2010, researchers found that states with medical cannabis laws had a 24.8% lower average opioid painkiller overdose death rate than states without them. Washington and Oregon were among the three states whose laws took effect before 1999. The authors cautioned that the finding was a correlation between state policies and state death rates, not proof that cannabis prevented deaths.

In 2019, Stanford researchers repeated the analysis with the same methods and extended it through 2017. The association reversed direction, from about 21% lower to about 23% higher opioid overdose death rates in medical cannabis states, and recreational laws showed no link either way. The authors concluded the original association was most likely spurious and that claims that cannabis laws reduce overdose deaths should be met with skepticism.

The lesson is about method: comparing states over time can pick up many things that change at once, such as fentanyl’s arrival, prescribing rules and naloxone access. It cannot show what individual patients do.

Can Cannabis Replace or Reduce Painkillers?

Studies that follow patients give a less hopeful picture than surveys.

• A 2021 systematic review in BMJ Open looked at five randomized trials and 12 observational studies of adding cannabis to prescription opioids. The trials, all in cancer pain, found high-certainty evidence of little or no added pain relief and more nausea and vomiting. Observational studies suggested lower opioid doses, but with very low certainty. The authors concluded the opioid-sparing effect remains uncertain.
• The Australian POINT study followed 1,514 people with chronic non-cancer pain on prescribed opioids for four years. Those who used cannabis had more pain and anxiety, and there was no evidence that cannabis reduced pain, lowered opioid doses or helped people stop opioids.
• A U.S. analysis of national survey data found that adults who used cannabis were more likely, not less, to start misusing prescription opioids three years later. That is an association that may reflect shared risk factors, but it cuts against the idea that cannabis protects against opioid problems.

None of this means cannabis never helps an individual patient with pain. It means the population-level claim that cannabis replaces opioids has not held up. Pain evidence by condition is in our arthritis and fibromyalgia guides.

Cannabis, CBD and Opioid Addiction Treatment

The treatments with strong evidence for opioid use disorder are medications. NIDA says methadone, buprenorphine and naltrexone help people stop or reduce opioid use, and that people treated with methadone or buprenorphine are less likely to die of an overdose than people who go untreated.

Researchers are studying whether cannabinoids could help alongside those medications:

• CBD and cravings. In a 2019 Mount Sinai trial of people abstaining from heroin, 400 or 800 mg of CBD for three days reduced drug cue-induced craving and anxiety compared with placebo, with effects still present a week later. It was a small, short trial and did not measure relapse. Larger studies are needed.
• Cannabis during treatment. A 2020 review of 41 studies of patients on methadone, buprenorphine or naltrexone found most showed no significant link between cannabis use and treatment outcomes. Cannabis use is unlikely to derail treatment by itself, but it is not a substitute.

The old claim that cannabis has “a miniscule to non-existent chance” of addiction is wrong. About 3 in 10 people who use cannabis have cannabis use disorder, according to the CDC. Our guide to marijuana addiction covers who is most at risk.

Risks and Side Effects

• Combined sedation. Cannabis can add to the drowsiness and impaired coordination caused by opioids, raising the risk of falls and crashes.
• Nausea and vomiting. More common when cannabis is added to opioids in trials; heavy use can also cause cannabinoid hyperemesis syndrome.
• Cannabis use disorder, especially with daily, high-THC use.
• Mental health. Anxiety, and a higher psychosis risk with frequent use.
• Contaminated street drugs. Counterfeit pills and illicit drugs can contain fentanyl. Cannabis from licensed stores in states such as Washington and Oregon is tested, while illicit products are not; find licensed shops in our Washington and Oregon directories.

Talk to Your Doctor

Do not stop or cut prescribed opioids suddenly on your own. Abrupt changes can cause withdrawal, uncontrolled pain and, if you later return to your old dose, overdose. If you want to use cannabis for pain or to reduce opioids, plan it with your prescriber, who can taper safely and watch for interactions. If you or someone you know is struggling with opioids, ask about methadone, buprenorphine or naltrexone, keep naloxone on hand, and call the SAMHSA National Helpline at 1-800-662-4357 for free, confidential referrals. Washington residents can also reach the Washington Recovery Help Line at 1-866-789-1511.

Marijuana and Opioids FAQ

More studies in our cannabis research section.

For adults 21+ in legal states. General information, not medical advice. Talk to a doctor before using cannabis for a health condition.