The odds of a smoker getting lung cancer vary from 1% - 15% depending on various factors explained in this article. The fact is that the vast majority of smokers don't get lung cancer that's what's up.
I couldn’t get your link to load. But the numbers you presented suggest a total lack of probable causation. Perhaps this is partly why none in my family, whether smoker or not have ever gotten lung cancer. That includes none of the children who happened to be exposed to the smoke of the smokers.
If this “scientific theory” based on the alleged correlations of smokers and those who they expose to cancer with their secondhand smoke, were based on my family history, it would have no standing whatsoever. Heck, we don’t even make the one percenters. We sit squarely at zero percent.
This is not to suggest everyone go smoke or smoke in front of their children. My experience is an islolated one within my own family experience. Today I will not smoke anywhere near my grandson. So yea, they got to me. Even though I have been exposed to it all my life without any ill fate, I find myself surrendering to the current cause celeb submitting to their fears bogus or not. Since if later in life my grandson developed asthma, who do you think would get the blame if I smoked in front of him?