Divorce from a husband who is addicted to smoking

Smoking is one of the evil things that are forbidden, and it
causes a great deal of harm. Allaah says in His Holy Book, in Soorat
al-Maa’idah (interpretation of the meaning): 

“They ask you (O
Muhammad) what is lawful for them (as food ). Say: ‘Lawful unto you are
At‑Tayyibaat [all kinds of Halaal (lawful‑good) foods which Allaah has made
lawful (meat of slaughtered eatable animals, milk products, fats, vegetables
and fruits)]’” [al-Maa’idah 5:4]

 And He says in Soorat al-A’raaf, describing the Prophet
Muhammad (peace and blessings of Allaah be upon him):

 “he allows them as lawful At‑Tayyibaat (i.e. all good and
lawful as regards things, deeds, beliefs, persons and foods), and prohibits
them as unlawful Al‑Khabaa’ith (i.e. all evil and unlawful as regards
things, deeds, beliefs, persons and foods)”

[al-A’raaf 5:157] 

Undoubtedly smoking is an evil and unlawful thing, so your
husband must give it up and keep away from it, in obedience to Allaah and
His Messenger (peace and blessings of Allaah be upon him) and so as to
avoid that which incurs the wrath of Allaah, and to protect his religious
commitment and health, and to maintain good relations with you.  As
expiation for his broken oath he must offer kafaarat yameen, as well as
repenting to Allaah for starting to smoke again. This expiation means
feeding or clothing ten poor persons, or freeing a believing slave; it is
sufficient to give them dinner or lunch, or to give each of them half a saa’
of the staple food of the country Which is equivalent to a kilo and a half.

We advise you not to ask him for a divorce if he prays and he
is a man of good conduct, and if he gives up smoking. But if he persists in
this sin there is nothing to prevent you from asking him for a divorce.