There are about 25 slots machine plus table games in the casino annex and while there isn't smoking there, during our cruise the smoke from the main casino just permeated the entire area around the casino. It permeated into the atrium area too and you could smell it on decks 3, 4, and 5. Maybe there were just more smokers on our sailing but it was absolutely awful.
The casino annex is very small and tight. You could barely walk between the chairs and then you have the scooters coming in so it was uncomfortable and pretty full the times we attempted to go there.