“There is sufficient evidence that medical marijuana is effective in treating epileptic seizures and chronic pain.
Medical marijuana may improve the level of functioning and quality of life for individuals with certain disabilities.”
https://www.ncbi.nlm.nih.gov/pubmed/30456993
https://www.tandfonline.com/doi/abs/10.1080/09638288.2018.1523952?journalCode=idre20