.
I bit nails all my life and dropped it with a simple technique I picked up online:
Get some elastics that fit comfortably around your wrist. As soon as you
notice that you are biting your nails or are in the process of bringing your fingers to your mouth snap the elastic on your wrist once and go on with your life. Next time same thing, and so on. I would wager that unless you have some type of obsessive compulsive disorder (rare, you probably don't) you'll kick the habit in less than a week.
The rational is to give us something productive to do as a replacement behaviour
as soon as we notice the unwanted behavior. This gives us several things:
1. Stopping a behavior is incredibly hard, but replacing it with another is simple.
2. We become aware of unconscious habits while they are happening.
3. A positive behavior that we feel good for doing after the unwanted behavior - we feel good about ourselves rather than disgusted or pathetic for biting our nails.
Good luck.
