What is the proper name for a chewing compulsion?

I chew as a stress reliever and its also just a constant thing. I am almost ALWAYS chewing. Used to be my hair, but i learned how many germs are on my hair. So i quit. then it was fingernails. I a)found the excessive amount of bacteria and b) got a nail embedded in the roof of my mouth (ouch). now i chew anything that gets near my mouth really. and if i have nothing around to chew, i chew my lips. they are cracked and verrrry chapped. sometimes they bleed. I admit i'm a hypochondriac so perhaps this isn't a compulsive disorder but idk. If it is im curious if it has a proper name like hair pulling is called trichto...something mania XD