On the scale of things Americans do that are harmful to other people (directly and indirectly) smoking is pretty far down. And lets not even begin on the scale of things that potentially annoy others.
Look into some of the more recent data and reanalyses of old data on the effects of secondhand smoke. Nobody is going to be claiming it's beneficial to anyone's health, but given the crap that in the air most places, the effect is not observable in public situations.
Unless you're talking about something like a member of your carpool smoking, or a roomate smoking while you're sitting on the couch watching TV together... your argument is basically "I dislike the smell."
The same argument can be made about people who wear perfume or go to the gym & don't shower immediately afterwards or eat beans & cabbage for lunch. And if you're in sitations where you're spending a significant amount of time in proximity to smokers, you probably know them well enough to ask them to modify.
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Simple Machines in Higher Dimensions
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