Over half of medical cannabis users reported substituting it for prescription drugs

Of 2,841 respondents using cannabis medically (91% non-prescribed), 54.6% used it to replace a prescription drug. Pain medication (67.2%), antidepressants (24.5%), and arthritis medication (20.7%) were most commonly replaced. Among substituters, 38.1% completely stopped and 45.9% substantially decreased prescription use. CBD oil was the most common substitute (65.2%). 65.8% found cannabis "much more effective" than prescriptions, and 85.5% rated prescription side effects as "much worse."

Self-selected convenience sample recruited through social media, public media, and patient organizations. Anonymous online survey of adults using cannabis (prescribed or non-prescribed) for medical purposes. Compared substitution and non-substitution users.

If cannabis is enabling people to reduce or eliminate prescription drug use, particularly opioids, this has enormous public health implications. The scale of self-reported substitution (over half of medical users) and the specific drugs being replaced deserve clinical attention.

The dominance of CBD oil (65.2%) among substitution products suggests many people are using non-intoxicating cannabis products for medical purposes, challenging the stereotype that medical cannabis is primarily about getting high. The opioid substitution finding aligns with ecological studies showing lower opioid prescribing in states with cannabis access.

Self-selected convenience sample with strong selection bias. Non-prescribed cannabis users may differ from prescribed users. Self-reported effectiveness is subjective. No clinical verification of conditions or outcomes.