“Joints will be free at Casinos before you know it.”
Unlikely. Out of an abundance of concern about Federal intervention, they are being quite careful to make it well known to their customers that smoking marijuana in the casinos or hotel rooms will not be tolerated.
They may warn people who want a joint that the Fedz still consider it illegal, but I seriously doubt they can't find a way to make sure than nothing other than the occasional token Fed shows up to do anything about it.