Don't even try. You're wading into the deep end here. I've been researching and debating this topic for over a decade now. You'll find a bunch of propaganda on the subject but very little hard science. The dose makes the poison and ETS doesn't come in high enough doses to pose a significant health risk. It gets even more interesting when you take the studies "supporting" your view at face value (stupid) and look deeper into what the conclusions really say. You'll find that a study will be touted as proving that ETS increases XYZ risk by 20 times!! Look closer and you'll see that your risk went from one in a 200 million to 1 in 10 million.
This is a crude oversimplification of things but I am not investing any real time into the specifics of the debate when it's obvious you don't have any solid understanding of the fundamentals involved.