i've been having this stupid habit since i was like 5 years old. i've tried very hard to break it, anything from chewing gum to smoking cigarettes lol... but it just doesnt work. sometimes situation does allow me to not bite my nails for an extended period of time. such as when the environment that im in is super dirty. (i was sent to work in a dirty chinese hospital for 2 weeks and i did not bite my nails, the second i came back home it started again, blah!) any tips?