Is it obligatory to obey one's parents even if the command involves assisting in sin?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: My father ordered me to ask for a cigarette for him. Do I obey him in this matter or not?

Answer:
Do not obey him; because this is a sin, and the Prophet (peace and blessings be upon him) said: created being. He (peace and blessings be upon him) said: Obedience is only in what is good, so do not obey anyone in disobedience to Allah. Not the father, not the one in authority, and not anyone else. There is no obedience in disobedience to Allah, ever. You must advise him, you must advise him, and admonish him, and make clear to him the dangers and harms of smoking, and that it is forbidden, perhaps Allah (Mighty and Majestic) will grant him repentance and the leaving of this harmful, corrupt substance.