title: Reply: misunderstandings in the misconception on the use of pack-years in analysis of smoking.
authors: J
authors: J
authors: Peto
mesh_terms: D004781:Environmental Exposure / Q000706:statistics & numerical data*; D006801:Humans; D008175:Lung Neoplasms / Q000453:epidemiology*; D012907:Smoking / Q000453:epidemiology*