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Like TLomon mentioned the tobacco industry is part of a well known conspiracy of the past. The tobacco industry was behind a PR campaign that counteracted scientific evidence which linked cigarette smoking to lung cancer.
In the 1980s, a new wave of lawsuits emerged. In the landmark case of that time, Cipollone v. Liggett, the plaintiff and her family alleged that cigarette manufacturers knew -- but did not warn consumers -- that smoking caused lung cancer and that cigarettes were addictive.