Alice, on the subject of non-smoking rooms getting the smoke through the ventilation system: Bar one or two exceptions, I haven't found that (I usually book non-smoking rooms despite being a smoker), but you'll be pleased to hear that the new legislations stipulates that from now on any hotel rooms where smoking would be permitted would have to be permanently assigned for the purpose and be on a separate ventilation system. I think the majority of hotels would not consider the expense worth it - could be wrong of course.