I am 13 years old and I really want to stop chewing gum, everyday before school I'll buy a packet of gum with about 8 chewing gum's inside then i will have finished that at the end of the day. I know that gum is bad for me ( chewing stimulates your stomach making it think that food is coming, then it makes the acid ready to digest the food, but because I'm chewing gum food never comes and the acid is still in my stomach...) I chew the gum in lessons and am hardly ever caught! :) ...

I really want to stop, how can I and what can i substitute for it?