That the "medical marijuana" ploy is being used by people who want to legalize marijuana, cynically.
This is certainly true. If it was really a medical issue, they'd take it up with the FDA, not states, and propose allowing it via prescriptions only.
BTW, I am all FOR considering how we might end the FDA stranglehold on Medical Drugs and their uses, especially for "orphan drugs". There are examples of life-saving drugs "on the shelf" unapproved, with a far more urgent need than cannabis for giving people the freedom to use them.