Certainly the duration and density of secondhand smoke matters, but I doubt that any amount of it is good. I can go dig up the research if you really care. To

Certainly the duration and density of secondhand smoke matters, but I doubt that any amount of it is good. I can go dig up the research if you really care. To your particular example of being in a restaurant, the increasingly-popular ban on smoking in bars and restaurants was largely driven by the negative health effects on the staff. Though again, I believe the effects on other patrons were non-zero. >>This is a problem with public healthcare, not smoking. We're agreed there. But getting rid of the public healthcare doesn't seem to be a realistic option at this point.