Actually, that's a stupid response. You've been marginalizing the effects of second hand smoke this entire thread! Just because you happen to find an author that talks of a few studies suddenly I'm supposed to discredit doctors from leading research facilities and governmental agencies who concur that secondhand smoke is bad.
FROM YOUR OWN ARTICLE:
Last July, introducing his office's latest report on secondhand smoke, then-U.S. Surgeon General Richard Carmona asserted that "there is no risk-free level of secondhand smoke exposure," that "breathing secondhand smoke for even a short time can damage cells and set the cancer process in motion," and that children exposed to secondhand smoke will "eventually . . . develop cardiovascular disease and cancers over time."
Did you read the whole article? I have skimmed the reports that are the basis of the second hand smoke fearmongering. The studies cited all use interviews to determine exposure levels. Further, they are not able to duplicate results. Also, standard levels of deviation were decreased in order to fit the data to the conclusions. The science is crap.