I am allergic to smoke and had a miserable allergy attack on RCCL's Sovereign of the Seas. Smoking is allowed almost everywhere on that ship, and the walls are yellowed from years of smoking...ugh!
In contrast, Disney is pretty non-smoker-friendly while still giving the smokers areas in which they can puff. In 35 Disney cruises, I have never gotten sick like I did on Sovereign, although there are a couple of times when I've had trouble. The worst spots I've found are:
Rockin Bar D/Wavebands: As others have said, it is VERY smoky. They forbid smoking during the day, when families can use it, but there is a smoking section after 9. Personally, I wish they would ban smoking whenever there is a show. I'm sure it wouldn't kill the smokers to hold off for 45 mins. to an hour, or else they could step out and up to deck 4 for a smoke. Another bad thing in there is the fact that much of the smoking section is literally right behind non-smoking, so you could be sitting right in front of a smoking table. The ventilation is bad, so you might run into the smell as far as the hall and even the guest services area on deck 3.
The verandahs: This is not usually a problem for me, since I like stateroom 5650, which only has a neighbor on one side. But two cruises ago, we were next door to a chain smoker who always stood at the verandah rail, right on our side, to smoke. I am not shy about speaking up (I've dealt with plenty of rude people lighting up in the non-smoking sections of restaurants), but I didn't feel it would be right in that situation because technically she was following the rules. But other than that, we haven't had a really bad verandah experience.
Castaway Cay: As someone else mentioned, if you choose a chair near smokers, it can be miserable (and of course there is always the fool who thinks it's cool to light up a cigar and share the stench with everyone around him). Since you never know who will sit next to you, choose chairs that are not too close to others.
The hallways by the staterooms. This is a sporadic problem, and I've never been able to figure it out. The most recent time was our last cruise...the deck 5 aft hallway reeked! I couldn't figure out whether some discourteous person was smoking in their room or whether they were doing it outside with the verandah door open (the wind draws it in). But every evening we smelled it when we returned to our room. This is a sporadic problem, so hopefully you won't notice it on your trip.
Deck 4: Often the odor of smoke gets inside on deck 4 because a lot of people go outside to smoke there.
I hope this info. will be helpful to you. Don't let it scare you...I'm just giving worst-case scenarios. Overall, Disney is a good cruise line for non-smokers, or at least much better than RCCL.
Barb
Visit the Platinum
Castaway Club at:
www.castawayclub.com