100 % reasonable , but don ' t expect your inlaws to understand . My mom smoked around all of us when we were kids , and only started restricting her smoking to a single room when my little brother nearly died of an asthma attack . She thinks this is reasonable as little brother doesn ' t go into that room . But because her sense of smell is destroyed from smoking , she doesn ' t realise that yes , the smoke DOES in fact permeate the rest of the house , and even gets into the upstairs even though she smokes downstairs . I ' m going to be facing a battle with her to explain why baby won ' t be staying over in her house , and asking her when she ' s in my house to change her clothes into ones she hasn ' t smoked in before holding my baby . Most smokers just don ' t get it , as their senses are completely destroyed from smoking . Sigh .