is a link to the FAQ regarding smoking. Carnival is pretty vague about their policy, so you may want to ask guest relations when you check in. If you have a spa cabin, then smoking is not permitted in the cabin. I'm not sure about the other cabin categories.
2007 - Majesty of the Seas (Bahamas)
2009 - Enchantment of the Seas (Western Caribbean)
2010 - Freedom of the Seas (Western Caribbean)
2013 - Golden Princess (Alaska, roundtrip from Seattle)