I don't know if this is a 'tool' so much, but it's something that's definitely worked for me these past few weeks.
It's brutal honesty, and complete self-awareness. At its root is mindfulness in everything I do. For the first time I'm catching myself when I get into old thinking habits, which allows me to recognize it (try not to judge) and then stop it in its tracks.
And it's not *just* cravings, but just general patterns of obsessive/anxious thinking that would were a part of my overall problem.