Refraining from visiting one's father due to his smoking

Question:
Honorable Shaykh, may Allah grant you success. A questioner says: I have refrained from going to my father (may Allah preserve him) because of his excessive smoking, as I suffer from asthma and it harms me. Am I sinful for this, considering that I call him on the phone and ask after him?

Answer:
Yes, there is nothing wrong with it. But convey your excuse; convey your excuse that you are unable to attend because of the smoke that enters your chest. Also, advise your father to stop smoking, for he is the one who has harmed himself and brought the illness upon himself. Advise him to leave smoking. Yes.
How can a person be content to let smoke enter his chest? There is no power and no strength except with Allah. The smoke is in the room; do you not enter it? You do not enter the room that has smoke in it, so how do you let smoke enter your chest, which is smaller than the room? What will be its effect on you? Yes.