The heck it ain't. Even the WHO (no, not the rock band) debunked second-hand smoke years ago.
it did kill my grand-aunt who was in a house full of smokers and never once fired one up herself. At least she lived to almost 90
But she lived a relatively long life though, so that point is moot.
That was the cause of her lung cancer, and her physician and medical examiner concurred.
"But she lived a relatively long life though, so that point is moot."
The point is that her physicians expected her to live to 100, and were it not for her exposure to decades of second-hand smoke (mind you, even 20 years after she was hardly around any), she would not have died of lung cancer. The irony is that her brother-in-law, my grandfather, smoked for nearly 70 years (from the time he was a child), and suffered absolutely no ill-effects whatsoever from his habit.
The World Health Organization report found that second hand smoke actually helped LOWER lung cancer rates compared with the general population. Tommy, can you hear me?