Not all people who smoke get lung cancer, lung cancer happens to non-smokers, and most of the evidence is in the form of statistical associations. Merely "prov

Not all people who smoke get lung cancer, lung cancer happens to non-smokers, and most of the evidence is in the form of statistical associations. Merely "proving smoking causes lung cancer" (rather than just association) was a major challenge, and strictly speaking, what he said is factually correct.