Well, smoking is officially (by that I mean by the university) banned from the entirety of the buggy course now (yes, this includes the chute), but it's hardly ever enforced (exceptions being when I have to chase design majors off the loading dock next to my office). I think I snapped at some Phikaps blowing smoke into my tent at raceday last year, but no, I have never seen FMB respond to people smoking outside their trucks. I would venture to say that the small flame from a lighter is far less likely to be harmful than a quietly leaking LP tank, but you're right in pointing out that smoking near the trucks doesn't seem to get addressed as a potential fire safety hazard like it probably should be.
(also good job for quitting! especially in china, where their smoking makes signu look like asthmatic grandmas)