Of course it may turn your stomach, but it won’t give you cancer. At least in California.
I confess bias: I smoke as many cigars as I can. And I certainly don’t want to poison my friends, or even turn their stomachs. But it has long seemed to me that one of the things that makes cigarettes so dangerous to smokers is the high temperature of the smoke; the paper and the additives make it very hot. Cigars are just tobacco, and cigar smoke is much cooler…so it follows that second hand smoke, having cooled down significantly, isn’t as dangerous as the stuff cigarette smokers inhale.
Anyway, here’s the data.