I think a lot of it stems from smokers who cannot smell their own smell. My father smoked for years and he was positive he didn't smell. Years and years ago, when non-smoking rooms came out, I was traveling with my parents and my dad got us a non-smoking room. I was surprised but pleased and figured he could just smoke outside. The next morning, as we were getting ready to leave, there was my dad, smoking in our non-smoking room. "Dad, you're smoking!" Too which he replied, "oh, no one will notice."

"Yes, Dad, they will." This was the days before the heavy fine in non-smoking rooms was done.