What is the ruling on someone who swore to quit smoking and to fast three months for every cigarette he smokes, then proceeded to smoke seven cigarettes? Does he fast for each cigarette, or does he offer expiation for all of them, or does he offer expiation for the first instance only?

Smoking is Islamically forbidden, and a smoker must quit it and offer sincere repentance. If a smoker swears to fast for three months should he smoke, and then smokes without fasting, he is obligated to offer an expiation for breaking an oath (kaffarat yamin). The expiation multiplies if he intended multiplicity or if the wording of the oath necessitated it; otherwise, it is a single expiation, and the oath is dissolved. If what he said was a vow made in anger and obstinacy (nadhr lajaj wa ghadab), he has the choice between fulfilling the vow or offering an expiation for breaking an oath. The expiation for breaking an oath is feeding ten poor people, or clothing them, or freeing a slave; if one is unable, then fasting for three days.