" According to the American Lung Association, smoking tobacco contributes to up to 90 percent of all lung cancer deaths. Men who smoke are twenty-three times more likely and women thirteen times more likely to develop lung cancer than nonsmokers. And smokers aren’t just harming themselves; thousands of deaths each year have been attributed to secondhand smoke. Nonsmokers have a 20–30 percent higher risk of developing lung cancer if they’re regularly exposed to cigarette smoke.3 "

― Michael Greger , How Not to Die: Discover the Foods Scientifically Proven to Prevent and Reverse Disease