How US airlines became smoke free.
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D001359:Aviation; D006801:Humans; D011640:Public Policy; D012130:Respiratory Hypersensitivity / Q000139:chemically induced; D012907:Smoking; D014028:Tobacco Smoke Pollution / Q000009:adverse effects; D014481:United States; D017132:Workplace
D014028:Tobacco Smoke Pollution