I think some people just like to chomp. I used to bribe my little grandson with carrots because he's a chomper. It may be that same type of thing. Did you suck your thumb when you were a baby? chew gum when you were a kid? Smoke as an adult?
None of the above! Isn't that strange? I'm looking online now and the ice craving is mostly anemia or b6 deficincy, but can also be zinc, thiamin and others. I'm going to see about a blood test and go check out some vitamins and see if I stop.