Surprise... guess why children of smokers are usually
asthmatics? Guess why non-smokers sometimes get lung cancer? Guess
why some folks get various respiratory problems like sinusitis? All
these might be attributed to passive smoking, the longer and
greater the exposure, the higher the risk.
Different bodies react differently to the same substance. One
person being able to 'survive' through years of smoking does not
conclusively prove that everyone will have the same outcome, and
vice versa. What we can do, is look at the statistics, and that
will make the situation glaringly obvious.
And, who says that you can't talk about death unless the factors
you've listed happens? 
