I am recovering nail biter.
Something I inherited from my Dad. My whole life, I never had nails. I really hated it, but could not not do it. Until, when I was in uni, I made a mental decision and within a month had healthy nails of decent length. Then, I'd get stressed-out; they would all go within a week. This past year I've relapsed twice. I'm back with nails again and I can't think how I ever do without them, they are so very handy!
I predict my next relapse around the 10th of December...