Indeed. But any effects are just intoxication.
Wrong and wrong. What the JAMA actually says (as opposed to the gross misrepresentation by the posted article) is: "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."
“Some evidence” is grounds for further research not for licensing “medical marijuana” dispensaries.