East, K, Hitchman, S C B, McDermott, M S, McNeill, A D, Herbec, A, Tountas, Y, Bécuwe, N, Demjén, T, Fu, M, Fernández, E, Mons, U, Trofor, A, Zatonski, W A, Fong, G T & Vardavas, C 2019, ' Social norms towards smoking and electronic cigarettes among adult smokers in seven European Countries : Findings from the EUREST-PLUS ITC Europe Surveys ', Tobacco Induced Diseases, vol. 16, A15 . https://doi.org/10.18332/tid/104417 Dipòsit Digital de la UB Universidad de Barcelona Tobacco Induced Diseases