Tobacco smoke and involuntary smoking by Alavanja, M, Baron, J, Brownson, R, Buffler, P, DeMarini, D, Djordjevic, M, Doll, R, Fontham, E, Gao, Y, Gray, N, Gupta, P, Hackshaw, A, Hecht, S, Husgafvel-Pursiainen, K, Matos, E, Peto, R, Phillips, D, Samet, J, Stoner, G, Thun, M, Trédaniel, J, Vineis, P, Wichmann, H, Wu, A, Zaridze, D