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Secondhand tobacco smoke (SHS) exposure has been proposed to be a risk factor for allergic diseases. Some studies have suggested that SHS exposure during pregnancy and infancy1 may be associated with allergic diseases during childhood, including asthma, rhinitis and atopic dermatitis. However, in Sweden some studies have found no increased chance of developing allergic diseases in children with smoking parents. It is unknown that how early SHS exposure may impact adolescents. In this study, the authors sought to use a large birth cohort to further evaluate the relationship between SHS and …
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.