" This brings us to the saddest episode int he whole smoking-cancer controversy: the deliberate efforts of the tobacco companies to deceive the public about the health risks. If Nature is like a genie that answers a question truthfully but only exactly as it is asked, imagine how much more difficult it is for scientists to face an adversary that intends to deceive us. The cigarette wars were science’s first confrontation with organized denialism, and no one was prepared.The tobacco companies magnified any shred of scientific controversy they could. They set up their own Tobacco Industry Research Committee, a front organization that gave money to scientists to study issues related to cancer or tobacco—but somehow never got around to the central question. When they could find legitimate skeptics of the smoking-cancer connection—such as R. A.Fisher and Jacob Yerushalmy—the tobacco companies paid them consulting fees. "

― , The Book of Why: The New Science of Cause and Effect