Ruling on smoking and chewing tobacco

Smoking is haraam, because it is evil and
because it causes a great deal of harm. Allaah has permitted to His
slaves only good kinds of food and drink, and He has forbidden the bad
kinds. Allaah says (interpretation of the meaning):

“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 7:157] 

All forms of smoking are kinds of khabaa’ith (evil
and unlawful things), and they include harmful and intoxicating substances.
It is haraam to deal with it in any way, whether one inhales it, chews
it or deals with it in any of its other forms. It is obligatory upon
every Muslim to give up these things and to hasten to repent to Allaah,
and to regret having committed this sin, and to resolve never to go
back to it. May Allaah help us and you to do all that is good.