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Cigarette smoke is a more direct source of benzene.

(Ergo, do not smoke while using a Mac Pro and covered in gasoline.)

I am suddenly hit with this image of some mechanic who has a smoking addiction and just got done fixing a car which had a leaking gas tank come in, sit down, light up, and get on a Mac Pro which reaks for some unknown reason... =O

Benzene would certainly be the least of your worries in that case.

http://en.wikipedia.org/wiki/Understatement

If you smell gas strongly while filling up you are doing it wrong.

First some states require vapor recovery, and second you are outside and your nose is not inches from the nozzle - you should not be getting exposed to much of anything.

that's what i was going to say, too. Probably negligible in comparison.