It seems logical to separate "wood-burning" smoke from tobacco smoke for research and policy purposes. Your popcorn factory example doesn't apply here at all.

It seems logical to separate "wood-burning" smoke from tobacco smoke for research and policy purposes. Your popcorn factory example doesn't apply here at all. They are not saying "smokers have health problems, therefore second-hand smokers have problems". They are directly tying second hand smoke to the health problems. If you think this is "fake news", please refer to the reference section.