Day 12 and still wanting junk food!!!!!

I have read all the messages about not being hungry after being on this diet for a while. I am on day 12 of my Master-Cleanse and all I can think of when I get off this diet is munching out. Anyone else feel like this. I have lost 18 lbs. so far, and I want to eat right, I'm just a little apprehensive about going off the diet.