I always remember a gig I played in a small pub in Fulham a few years back. Looking from the stage, I could see this great big cloud hovering over the top of the entire pub. Dry ice would've been preferable . Now when you go into a pub, you can smell polish, and you can recognise what flavour crisps people were having.
When you get home, you can't smell the tar/nicotine on your clothes next day.