I'll make you a deal: Explain to me what a p-value is in your own words. How is it derived? What does it mean?
Why does that matter? Explain to me the same thing for a chi square test or a Student's t-test. If you can't do that, then you can't interpret the research anyway.
There is an abundance of research on the subject. That information is readily available on PubMed. But what matters is being able to properly interpret research.
People who do that for a living (including me) are quite satisfied with the breadth and depth of research on the subject. It is quite clear -- secondhand smoke contributes significantly to health problems including cardiovascular disease, asthma, and other lung diseases. If you wish to dispute that, then it falls to YOU to demonstrate where the research is wrong.
That's how science works.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.