We all know how hard it is to try to change our habits. What type of diet are you following? Do you still feel hungry after you have your meal? Why do you keep the cereal in the house? Is it for your kids? Maybe you can try to get them to eat something else for breakfast while you break the cereal habit. Also, you may want to plan your meals so you can have a little diet-friendly treat after each one.
You will find that after a while you will not miss having all that cereal.
PS--I looooove frosted mini-wheats, but they are not allowed in my house; at least not until I lose all the weight I need to lose.