I am under the impression that it is the THC that is beneficial and modifies the TH1 and TH2 ( and therefore the pain )
Our results showed that THC treatment leads to the association of active histone modification signals to Th2 cytokine genes and suppressive modification signals to Th1 cytokine genes, indicating that such a mechanism may play a critical role in THC-mediated switch from Th1 to Th2," reads the study's abstract. "At the global level, a significant portion of histone methylation and acetylation regions were altered by THC."
The epigenomes, "histones," lead to the suppression of inflammation. The THC in marijuana can help manipulate these epigenomes to suppress inflammation in the body, being that inflammation worsens one's autoimmune condition.www.scienceworldreport.com/articles/15145/20140603/autoimmune-diseases-treated-medical-marijuana.htm