Nicotine addiction is strong, and if someone really wanted to quite the spit or smoke, it still isn't easy... particularly chew. Even dedicated, fearful people, who desperately want off can't get there. If his attitude were different, as in he really wanted to do this for himself and for you, I would suggest that he see a doctor, since there are Rx level nicotine substitutes, like inhalers that can help him get past the cravings. Then he could step down to over the counter substitutes, and finally off all together. It might take a few months. But the truth is he has to want this. If the person he loves cannot convince him, and he is not willing on his own, the last option is counseling. But that again takes motivation on his own to want to discuss this with someone else. I have seen cancer patients in the radiation room, who step outside after treatment and light up a cigarette. That defies logic and rational behavior, but it defines addiction.