The fact that marijuana has almost zero medical use was a well a well established fact long before the left and the libertarians started demagoguing on the legalization movement.
JAMA: "There is some evidence to support the use of marijuana for nausea and vomiting related to chemotherapy, specific pain syndromes, and spasticity from multiple sclerosis."
You need to look into Chinese Medicine that has used it for only a few thousand years. As for study’s, would you spend a 100 million $ of your money for a product that is natural and can not be patented? No patent no profit. Big Medicine could care less about you! The faster you get cancer and become a $400,000 profit the better.