The ruling on one who swore to abstain from smoking and then smoked

This is a letter from our brother Hasan Awadh from the Arab Republic of Egypt. He says: I am residing in Jordan. My problem is that when I resolved to travel to Jordan, I swore a firm oath to myself that I would not smoke during my entire absence in Jordan. I placed the Noble Qur'an on my forehead, and then I found myself smoking. What is the ruling in Islam regarding this? Please guide us; may Allah reward you.
Answer: You must repent to Allah, because smoking is forbidden (haram) and not permissible, as its harm is great and serious. So, my brother, you must repent to Allah, feel remorse for what you did, and... not return to it. You must also pay the expiation (kaffarah) for breaking your oath: feeding ten poor people or clothing them. You feed them half a sa' of dates or rice, or you provide them with dinner or lunch, or you clothe them with a garment, and this is sufficient. You must also repent to Allah from smoking and beware of it, because its evil is much and its harms are great. May Allah guide you and show you the right path.