Exposure to Secondhand Tobacco Smoke Enhances Respiratory Symptoms and Responses to Animals in 8,819 Children in Kindergarten: Results from 25 Districts in Northeast China

Abstract

This study provides evidence that animal and ETS exposure increases the risk of asthma-related symptoms in children in kindergarten. ETS exposure in utero did modify the effect of animal exposure on persistent phlegm and persistent cough but not on doctor-diagnosed asthma among children.