In contrast, opioids, which are often prescribed for chronic pain, have contributed to hundreds of thousands of overdose deaths over the past few decades. Even common pain medications like nonsteroidal anti-inflammatory drugs, such as ibuprofen, cause tens of thousands of hospitalizations and thousands of deaths each year from gastrointestinal damage.

Furthermore, both opioids and nonopioid pain medications have limited effectiveness for treating chronic pain. Medications used for chronic pain can provide small to moderate pain relief in some people, but many ultimately cause side effects that outweigh any gains.

These safety issues and limited benefit have led many people with chronic pain to try cannabis as a chronic pain treatment alternative. Indeed, in survey studies, my colleagues and I show that people substituted cannabis for pain medications often because cannabis had fewer negative side effects.

However, more rigorous research on cannabis for chronic pain is needed. So far, clinical trials – considered the gold standard – have been short in length and focused on small numbers of people. What’s more, my colleagues and I have shown that these studies employ medications and dosing regimes that are far different from how consumers actually use products from state-licensed cannabis dispensaries. Cannabis also causes recognizable effects such as euphoria, altered perceptions and thinking differently, so it is difficult to conduct double-blind studies.

Despite these challenges, a group of cannabis and pain specialists published a proposed guideline for clinical practice in early 2024 to synthesize existing evidence and help guide clinical practice. This guideline recommended that cannabis products be used when pain is coupled with sleep problems, muscle spasticity and anxiety. These multiple benefits mean that cannabis could potentially help people avoid taking a separate medication for each symptom.

Since the Controlled Substance Act was passed in 1970, the federal government has designated cannabis as a Schedule I substance, along with other drugs such as heroin and LSD. Possession of these drugs is criminalized, and under the federal definition they have “no currently accepted medical use, with a high potential for abuse.” Because of this designation and the limits placed on drug manufacturing, cannabis is very difficult to study.

State and federal regulatory barriers also delay or prevent studies from being approved and conducted. For example, I can purchase cannabis from state-licensed dispensaries in my hometown of Ann Arbor, Michigan. As a scientist, however, it is very challenging to legally test whether these products help pain.

Reclassifying cannabis as a Schedule III drug has the potential to substantially open up this research landscape and help overcome these barriers.

Psychedelics, such as psilocybin-containing mushrooms, occupy an eerily similar scientific and political landscape as cannabis. Used for thousands of years for ceremonial and healing purposes, psilocybin is also classified as a Schedule I drug. It can cause substantial changes in sensory perception, mood and sense of self that can lead to therapeutic benefits. And, like cannabis, psilocybin has minimal risk of lethal overdose.

Clinical trials combining psilocybin with psychotherapy in the weeks before and after taking the drug report substantial improvements in symptoms of psychiatric conditions such as treatment-resistant depression and alcohol use disorder.

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