Plan for the difficult moments.
Lemon>>Bite into a lemon, skin and all.
Freezer>>Stick your head in the freezer and count backwards from 20.
Mouth Melt>>Fill your mouth with ice cubes and try to not get brain freeze.
or, Walk away from the situation for a moment. You can return when the crave passes.
Don't drink alcohol until you are secure in your quit.
(It weakens your resolve and gives permission.)
Drink plenty of water
Positive self talk>> "I don't do that anymore."
And, healthy distractions>>Exercise, Music, Hobbies, Volunteering.