I'm sure one can find a website that backs up anything we want, however, until they explain why people like myself can grow up with a parent that smoked in the house, in the car (windows closed) and I myself smoked from age 10 to 50 have escaped lung cancer and someone can make an argument that walking through an OPEN AIR area with a slight odor of cigarette smoke can all of a sudden get cancer "caused by second hand smoke". Makes no sense at all. Some other factor, much stronger is involved we just don't know what that is yet, so let's blame it on second hand smoke no matter how minor the exposure is. I have never once said that it was not a threat to people with existing conditions, either known of unknown, however, let's use some common sense when it comes to what the cause is.