They do on some of the Carnival ships - the Splendor, the Magic, the Dream, and the Breeze all have the "Spa cabins" -- these cabins allow unlimited access to the Cloud 9 Spa facilities (treatments still cost) and are ALL non-smoking, including the balconies - you have to sign a form stating that you will pay a $250 fine if you're caught smoking ANYWHERE -- these cabins are usually on the top two Forward decks -- we've stayed in them twice now and LOVE them.