The fact that smoking causes lung cancer is so well established that only the tobacco companies still claim to have doubts. Now an Environmental Protection Agency review board, acting on a draft report produced within the agency, says nonsmokers are in danger as well. "Environmental tobacco smoke" -- better known as secondhand smoke -- inhaled by those who associate with smokers leads to about 3,000 cases of lung cancer a year in the U.S. and 300,000 cases of respiratory disease. Conclusion: secondhand smoke should be classified as a major carcinogen, which could lead to even stronger restrictions on smoking in public.
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