I'm going to make my boyfriend quit smoking
Why does he need to stop smoking?
I can't be with a man who will die sooner because of smoking.
I think it's wonderful of you to want to try and help him!  Dealing with an addiction is very hard and having someone to help you is a huge plus.  I wish you two the best!
It's easier said than done. He smokes a pack of cigarettes every day, he needs to become super clean. Like, get rid of the nicotine problem.
It is probably going to take some time, but I am glad that you are there to help him. It is good to try to help others beat their addiction.