Fact
For approximately 50 years, tobacco companies falsely and fraudulently denied that smoking causes lung cancer and emphysema.
Source 1:
"United States of America, Plaintiff, and Tobacco-Free Kids Action Fund, American Cancer Society, American Heart Association, American Lung Association, Americans for Nonsmokers' Rights, and Nationals African American Tobacco Prevention Network, Intervenors, and Philip Morris USA, Inc. (f/k/a Philip Morris, Inc.), et al., Defendants." United States District Court for the District of Columbia. 17 Aug. 2006: 1-4, 219, 259, 293, 330, 479, 655, 819, 1397. Document.
http://tobaccofreekids.org/content/what_we_do/industry_watch/doj/FinalOpinion.pdf