A loving relationship, with great communication bodes well

Once she gets past that initial week, and the physical withdrawal, it'll get easier. There's something to be said for a plan. You know... quit when you've got fully scheduled days already coming to limit the hours needed to self manage the initial pangs; have something to stick in your mouth like gum, tic tacs, jolly ranchers, etc; have BF on tap for fun distracting.
Sending good vibes your way~~~