Uppers like cocaine, amphetamines, etc. also have a side effect of supressing you appetite, so it is very normal that you're hungry all the time now that you're not on the drug. Also, if you were not eating before or not eating properly, I'm sure your body is malnourished and it's telling you to give it nutrients. My friend is addicted to Aderall - when he's on them, he almost never eats because he's never hungry, but when he runs out of the pills, watch out! He can eat forever. He also said when that happens, he eats because he's trying to fill a void. Take care of yourself.