Sugar IS addictive. However, a person can break a sugar addition. It won't be easy, but it can be done. First, I'm going to recommend you read these great spark articles on breaking a sugar habit. You'll find them extremely helpful. www.sparkpeople.com/resource/nutrition_art
These will give you some techniques to help you break your addiction to sugar.
Mostly, you must be patient with yourself and your body. It's going to time to learn new healthier habits. You're going to have to cut yourself some slack. you're going to make mistakes and that's okay. it's part of the learning process.
One thing I would suggest is going to the store and buying some fresh fruit. When you feel an urge to snack (and it is okay to snack), have a piece of fruit instead of a treat. Do your best to try to eat more fresh fruit as a snack. With time, the natural sweetness of the fruit will help you curb your cravings for refined sugar.
Go by some strawberries, cherries, apples, pears, peaches... whatever is on sale. when you want something sweet, have a piece of fruit. Also, with time, you're going to find that the fresh fruit takes a lot better than the junk. Fresh fruit also has FIBER. eating foods that are high in fiber will help keep your blood sugar stable. that spiking and crashing of your blood sugar is one reason you keep craving the junk. It's a sugar high and that's not healthy.
Another thing, if you have too much junk in the house, get rid of it. out of sight. out of mind. if it's not in the house, you won't eat it. if you have to have treats in the house, then you're going to have to learn to moderate your eating habits.
As I said, changing your habits won't be easy. this is going to take time. but you really CAN make a change for the better !!
Be kind to yourself as you would to others.