A man standing in a kitchen , holding a rolling pin and smoking a cigarette .
It is impossible that his children are coughing because he is exposing them to second-hand smoke .
It is impossible that his children are coughing because he is exposing them to second-hand smoke .
It is certain that his children are coughing because he is exposing them to second-hand smoke .
His children are coughing because he is exposing them to second-hand smoke .