I am just wondering whether fire smoke will harm my acoustic guitar in any way.

I know it will probably smell like smoke like your clothes do but would that do anything negative to it?

Well a smokers guitar usually yellows and your fingers smell after playing it, but I doubt brief and infrequent exposure to campfire smoke will do any harm...
GENERATION 10: The first time you see this, copy it into your sig on any forum and add 1 to the generation. Social experiment.