Medical Cannabis Patients Lost About 0.5% Symptom Relief Per Session as Tolerance Built Up | Research

The takeaway

Analysis of 120,691 treatment observations from 16,395 medical cannabis patients showed symptom relief decreased by 0.5% per session, with patients compensating by increasing dose but not THC potency.

medical cannabis prescribers, patients experiencing tolerance, dosing protocol researchers

What the researchers found

Patients experienced a 0.5% decrease in symptom relief per subsequent session (p<0.001). Combustion provided more relief than vaping, eating, or drinking. Higher doses provided greater relief. THC levels were positively associated with relief. Patients increased dose but not THC potency over time. Factors increasing relief also increased side effects. Results were similar for pain, depression, and anxiety.

Why it matters

This is the first large-scale measurement of cannabis tolerance in a medical context. The finding that tolerance develops at a consistent rate across symptom types has direct implications for dosing guidance and treatment planning.

The numbers in context

16,395 patients. 120,691 observations across 42,005 sessions. 0.5% decrease in relief per session (p<0.001). Combustion > vaping > eating/drinking for relief. Higher dose = more relief. Higher THC = more relief. Patients increased dose but not THC potency over time.

How the study worked

Fixed effects regression analysis of Releaf App data from 16,395 medical cannabis patients recording 42,005 sessions (120,691 symptom-treatment observations) from 2016-2022. Patients tracked symptoms, products, doses, and relief in real time.

What this study cannot tell us

App-based self-report data. Self-selected users of a tracking app may not represent all patients. Cannot verify products or doses. No clinical validation of symptom measures. Observational design. Session count is a proxy for tolerance development.

How to read the evidence

Very large real-world dataset with robust statistical methods, though app-based self-report and observational design limit to moderate.

When this study was published

Releaf App data from 2016-2022.

The bigger picture

The tolerance finding explains why many medical cannabis patients report needing higher doses over time. The trade-off between increasing dose for maintained relief and increasing side effects creates a clinical optimization challenge.

Questions still open

Can tolerance breaks restore original efficacy?
Is there a dose ceiling beyond which increasing dose no longer compensates for tolerance?

Common questions

Does cannabis stop working over time?

This study found symptom relief decreased by about 0.5% per session. Patients compensated by increasing their dose, but this also increased side effects.

Does tolerance affect all conditions equally?

The tolerance rate was similar whether patients were treating pain, depression, or anxiety, suggesting tolerance is a general phenomenon rather than symptom-specific.

Read the original research

Cannabis tolerance reduces symptom relief.

Frontiers in pharmacology, 16, 1496232

View on PubMed ↗Publisher’s paper ↗

Citation

Stith, Sarah S; Li, Xiaoxue; Brockelman, Franco; Keeling, Keenan; Hall, Branden; Vigil, Jacob M. (2025). Cannabis tolerance reduces symptom relief.. Frontiers in pharmacology, 16, 1496232. https://doi.org/10.3389/fphar.2025.1496232