The cumulative risk of lung cancer among current, ex- and never-smokers in European men. by Crispo, A, Brennan, P, Jöckel, K, Schaffrath-Rosario, A, Wichmann, H, Nyberg, F, Simonato, L, Merletti, F, Forastiere, F, Boffetta, P, Darby, S