I have to say, if you let him not wear a condom (as in giving your consent, even if grudgingly) you are just as responsible as he is for the pregnancy, though I absolutly agree he is a douchebag for the way he reacted to the news. I am sorry to hear about all you are going through, I wish you luck. I also urge you to refrain from smoking (though I know it is truthfully none of my business.) while pregnant.
Though there are no proven negative consiquences, it still isnt a risk you should take. Is 9 months worth of smoking really worth risking the baby's health?
I really wish you the best, and urge you to keep in touch with the father, if only for the sake of the child. It really is important.