As someone who went out to places that had smokers aplenty who were smoking like a chimney at full blast, I will say that changing clothes is never enough. And a shower too is needed to get the smoke out of the hair and skin. I could literally smell the smoke stench come out as I would wash up before bed — even as a non-smoker, even as someone who would try to move away from smokers.

I have sat next to more smoke-stinking passengers than sweat-stinking passengers. I am not sure if the issue with smoke-stinking passengers is made worse or better by airports having seemingly grown the number of designated smoking boxes/areas airside in some parts of the world.

If only more airports would have free showers for passengers, that may help a bit. Although I doubt smokers would use it as much as someone who realized they had a major sweat and would prefer to shower as soon as easily possible for no additional charge.