RT Journal Article SR Electronic T1 The independent role of prenatal and postnatal exposure to active and passive smoking on the development of early wheeze in children JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP ERJ-01016-2015 DO 10.1183/13993003.01016-2015 A1 C.I. Vardavas A1 C. Hohmann A1 E. Patelarou A1 D. Martinez A1 A.J. Henderson A1 R. Granell A1 J. Sunyer A1 M. Torrent A1 M.P. Fantini A1 D. Gori A1 I. Annesi-Maesano A1 R. Slama A1 L. Duijts A1 J.C. de Jongste A1 J.J. Aurrekoetxea A1 M. Basterrechea A1 E. Morales A1 F. Ballester A1 M. Murcia A1 C. Thijs A1 M. Mommers A1 C.E. Kuehni A1 E.A. Gaillard A1 C. Tischer A1 J. Heinrich A1 C. Pizzi A1 D. Zugna A1 U. Gehring A1 A. Wijga A1 L. Chatzi A1 M. Vassilaki A1 A. Bergström A1 E. Eller A1 S. Lau A1 T. Keil A1 M. Nieuwenhuijsen A1 M. Kogevinas YR 2016 UL http://erj.ersjournals.com/content/early/2016/03/10/13993003.01016-2015.abstract AB Maternal smoking during pregnancy increases childhood asthma risk, but health effects in children of nonsmoking mothers passively exposed to tobacco smoke during pregnancy are unclear. We examined the association of maternal passive smoking during pregnancy and wheeze in children aged ≤2 years.Individual data of 27 993 mother–child pairs from 15 European birth cohorts were combined in pooled analyses taking into consideration potential confounders.Children with maternal exposure to passive smoking during pregnancy and no other smoking exposure were more likely to develop wheeze up to the age of 2 years (OR 1.11, 95% CI 1.03–1.20) compared with unexposed children. Risk of wheeze was further increased by children's postnatal passive smoke exposure in addition to their mothers' passive exposure during pregnancy (OR 1.29, 95% CI 1.19–1.40) and highest in children with both sources of passive exposure and mothers who smoked actively during pregnancy (OR 1.73, 95% CI 1.59–1.88). Risk of wheeze associated with tobacco smoke exposure was higher in children with an allergic versus nonallergic family history.Maternal passive smoking exposure during pregnancy is an independent risk factor for wheeze in children up to the age of 2 years. Pregnant females should avoid active and passive exposure to tobacco smoke for the benefit of their children's health.Prenatal and postnatal exposure to active and passive smoking independently increase early wheeze risk in children http://ow.ly/XZvQQ