The 708 studies here are all peer reviewed and have been published in reputable medical and scientific journals. Many, if not most, are independent, randomly-selected double-blind studies with impeccable research methodology. Moreover, they have been cited by the US National Institutes of Health, the American Medical Association, the Office of the US Surgeon General, the US National Centers for Disease Control and Prevention, the World Health Organization, The American Cancer Society, The National Academies of Science, The White House, and other such disreputable purveyors of bu*****t.
Now if you have specific concerns with any study listed, let's hear it. But I'm tired of hearing pro-smoking drones go on about a lack of evidence tying second (and even first!) hand smoke to health.
If you don't like people smoking, maybe you could just not go where they're doing it.
Try it. It works for me.