As an occasional cigar smoker (especially on vacation) I try to stay away from people who I might bother. I usually take a walk on the beach or try to stay downwind of the crowd.
However, the most disgusting smell is cigarette smoke. I think it's the paper wrapper, which keeps it smoldering. If I'm around cigarette smokers, I usually join in with a stogie and puff away...and they think it stinks worse than their pack a day fire bomb! Just sayin...