When I crave chocolate pudding, I'll eventually make a bowl, and instead of splitting it into many desert cups (which I would just crave for), I eat the entire bowl in one go. Then I'm cured from pudding for a while.

Chips (or fries) though, I can't resist. Better not to buy any...

This is a common way to deal with diets and other things.

Do enough of the bad stuff to get sick of it enough to associate it with bad feedback, and that should keep you away from it in the future.

I try this with beer from time to time, the hangover isn't enough to make me quit for any significant amount of time :p.