I have asthma and am very sensitive to smoke. I have even had to leave a room when a smoker came in from outside where they were smoking - just the smoke smell on their clothes can trigger an attack for me. In my 4 cruises I have never had a problem on any cruise. We even sat in the cigar bar one night (we were in San Juan, so there weren't many people in there that night) - and managed to have a nice visit with Kuki when he came in for a break. I do avoid the casino and the sports bar. I did "suck it up" on our Hawaiian cruise to watch the Kentucky Derby in the sports bar. The derby is more fun when shared with other fans!!! Bottom line is don't get worked up about a problem until it is a problem.