Smoking is haraam and invalidates the fast

I think that this is a view for which there is no basis.
Rather smoking is a kind of drinking; in Arabic they say that one “drinks” a
cigarette. Moreover, there is no doubt that it reaches the stomach and the
inside of the body, and everything that reaches the stomach and the inside
of the body invalidates the fast, whether it is beneficial or harmful, even
if a person were to swallow a bead from the masbahah, or a piece of iron, or
anything else, it invalidates the fast. So it is not essential that the
thing that invalidates the fast, or that is eaten or drunk, should be
nourishing or beneficial. Everything that reaches the stomach is regarded as
food or drink. They believe – indeed they know – that this is a kind of
drink, and if anyone says this then he is being arrogant. 

Moreover, I think that the month of Ramadaan is an
opportunity for the one who is sincerely resolved and wants to give up this
foul, harmful habit of smoking. I think that it is an opportunity because he
is going to abstain from it throughout the day in Ramadaan, and at night he
can distract himself from it by means of the food and drink that Allaah has
permitted to him, and by frequenting the mosques and attending gatherings of
righteous people, and he can keep away from those who have this habit. If he
abstains from it throughout the month, then that will be a great help to him
in giving it up for the rest of his life. This is an opportunity which
smokers should not miss. End quote.