Again, tobacco is legal to purchase, possess and use. Does it make sense to have a product that is legally available, then put so many widespread restrictions upon where it can be used? Name another product that has similar restrictions that can also cause severe damage to other folks by its use...alcohol..nope you can drink almost anywhere on Disney property, and it can affect your neighbors, especially if you then decide to drive, which is legal until you reach the blood level limit in your state.
Disney doesn't police their rooms to the point of not allowing an addict to illegally use syringes of narcotics...they will even provide a needle disposal kit, no questions asked, they will assume the person is an insulin diabetic. So basically, smokers have less rights in their room than illegal drug addicts.
And remember, they sell cigs at Disney.