RT Journal Article T1 A three-generation study on the association of tobacco smoking with asthma A1 Accordini, Simone A1 Calciano, Lucia A1 Johannessen, Ane A1 Portas, Laura A1 Benediktsdottir, Bryndis A1 Bertelsen, Randi Jacobsen A1 Braback, Lennart A1 Carsin, Anne-Elie A1 Dharmage, Shyamali C. A1 Dratva, Julia A1 Forsberg, Bertil A1 Gómez Real, Francisco A1 Heinrich, Joachim A1 Holloway, John W. A1 Holm, Mathias A1 Janson, Christer A1 Jogi, Rain A1 Leynaert, Bénédicte A1 Malinovski, Andrei A1 Marcon, Alessandro A1 Martínez-Moratalla Rovira, Jesús A1 Raherison, Chantal A1 Sánchez Ramos, José Luis A1 Schlunssen, Vivi A1 Bono, Roberto A1 Corsico, Angelo Guido A1 Demoly, Pascal A1 Dorado Arenas, Sandra A1 Nowak, Dennis A1 Pin, Isabelle A1 Weyler, Joost A1 Jarvis, Deborah A1 Svanes, Cecilie AB Background: Mothers' smoking during pregnancy increases asthma risk in their offspring. There is some evidence that grandmothers' smoking may have a similar effect, and biological plausibility that fathers' smoking during adolescence may influence offspring's health through transmittable epigenetic changes in sperm precursor cells. We evaluated the three-generation associations of tobacco smoking with asthma. Methods: Between 2010 and 2013, at the European Community Respiratory Health Survey III clinical interview, 2233 mothers and 1964 fathers from 26 centres reported whether their offspring (aged