If you don't like my sources, fine ... feel free to go to:
http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=Second+Hand+Smoke You'll have tons to chose from. I opted to restrict the .com's and stuck to the .org, .edu and .gov.
The reason that all smokers and non-smokers suffer from SHS is pretty simple. We are all different. For example, you can probably take more sunshine than I can. I burn easily. Whereas I can probably withstand more G's than you can (I have an oversized heart). What is only a nuisance to some people, kills others (bee stings, for example).
The links you have brought in, have been read by us adnauseam, they do not improve with age....... or repeated reading.