<< There is minimal evidence that second hand smoke causes lung damage. >>
Well, growing up around people who smoke surely doesn't do your lungs a whole lot of good. At one point my mother smoked, and my aunt, uncle and grandfather have smoked as long as I can remember. I also lived in an area with some air pollution, and that is where my asthma comes from.
So especially if you already have respiratory problems, second hand smoke can make your symptoms and condition worse.
About the only way to test the lung damage is the pulmonary function test.