I'm sure something like this could be made to work. The non-smoking person who ended up beside the smoking section might not like it, but then there's plenty of people who hardly use their balconies at all, so if these cabins could be identified, then it might not be a problem.

I think the point about the rarity of fire is that:
a. on the one hand, fires on a ship a very serious, since there's no where to go.
b. on the other hand, we live in an era of extreme political correctness where everybody's safety seems paramount--to the point of absurdity -- don't dare build a monkey bar or a slide that might allow a child to fall off -- warn people not to eat pieces of plastic in packing.

I have lived with smokers most of my life, and thankfully never became an addict, although I was a social smoker off and on. I am very happy to be smoke free, but I strongly believe that smokers have rights too, and I suspect Regent is thinking right now, "what have we done?!"