repeat after me, "it's just brain chemistry, it's just brain chemistry." Our habitual self-drugging (cigarettes, sugar, whatever) puts us in the position of wanting to keep feeding that chemical need we've created. Except for l-glutamine between meals, I don't know of any physical way to make it through cravings but the white-knuckle method.

Psychological tools, though--there are many. Imagine yourself at goal weight; every time that image of ice cream pops up, mentally mix some dirt into it so that the image is gross rather than attractive; use affirmations like "the cravings are weakening" and "I'm stronger than any food" And distract yourself. This would be a good day to clean out the garage (or whatever messy big project you've been putting off)

best of luck to you! and congrats on stopping smoking.