The primary purpose of this study was to determine if inhaled cannabis decreases self-reported pain ratings. They used data from the StrainPrint app that included over 130,000 sessions (administration of a dose) in which inhaled cannabis was used to treat muscle pain, joint pain, or nerve pain. It was published in February 2022 in the journal Cannabis and Cannabinoids Research.
"For all three pain symptoms, severity ratings decreased significantly after cannabis use." The reduction in self-reported pain severity was 42-49% (almost cut in half).
Vaping was found to be more effective than smoking for joint pain, and low doses seemed to work better for nerve pain. They also found that the dose used to manage pain increased over time, suggesting a tolerance (accommodation) to cannabis' pain reduction effects happens when used consistently.
The abstract of the research paper is here at Liebertpub.com.