What?
By extension, if the mechanism for transmitting the harmful elements into a smoker's body result from LIGHTING CARCINOGENS ON FIRE AND INHALING THEM, I don't want to be around you when you're doing that.
Sure, we can discuss other issues of exposure, build-up, etc., but I reject the notion that second-hand smoke is harmless. I also am amazed by the mothers crowing about their failure to stop smoking while pregnant.