Really makes no sense to allow smoking in the Casio but not on your balcony.
The casino make money off smokers and non-smokers, and yes they will tell you that if you aren't sitting at a table game or slot, you cannot smoke. It's about the money.
I have always booked a balcony because I like to smoke but never have in the cabin. I can understand not smoking in the cabin because of the smell that it leave in the room, I don't even smoke in our home or car.