It is particularly significant, however, that the review states quite clearly that there is “conclusive or substantial evidence” that marijuana is effective for the treatment of chronic pain, as a tonic for nausea and vomiting in cancer patients undergoing chemotherapy, and in treating spasticity in multiple sclerosis patients.

“Given that our federal government still considers it Schedule I, which means there are no accepted medical benefits…this is a pretty clear refutation of that,” Taylor West, the deputy director of the National Cannabis Industry Association, told ThinkProgress.

Read more: https://thinkprogress.org/huge-study-refutes-government-marijuana-b6385b7bedeb#.r4v6t7gc2