There is no way to "air out" a smoker. The smoke is in their clothes, hair, breath, body etc. Just walking around outside will not dissipate the smell. I used to work with a bunch of smokers and the smoking area was outside, so they had to walk down a path to an outside seating area. Even walking outside, smoking outside, and walking back after the cigarette, they still stunk when they came back. Nothing you can do.

Probably wasn't true, but who knows.....