Most Helpful Guy
He might not understand that nicotine addiction is a disease. I can't say for sure if he will forgiveness you or not. While based on my understanding here that he overreacted, I don't think it's the right way to go about it. The overwhelming majority of people who try to wit smoking fail more than once before quitting for good. Whether or not he forgives you, make sure you keep striving to wit, and never give up!
Most Helpful Girl
You’ve broken his trust, this is obviously an important issue to him and instead of asking for support and help you went behind his back.
If it’s not something you’re willing to do then you’re most likely incompatible as a couple and should look for others better suited.
It’ll be awkward for awhile but if you’re courteous and polite it settles