If you can't find a suitable distraction or habit to help you stop biting your nails, you might try addressing the problem therapeutically. This can be tricky since nail biting is not generally considered a specific disorder and most remedies are of the do-it-yourself variety. Still, there are other options for the would-be quitter, including online support groups. You could also find a "quit buddy" to help you on your journey to a bite-free existence.