I used to do it all the time, then stopped. Rob had asked me to stop, and I just stopped thinking about doing it. I did paint my nails for a little while just in case, and then I got acrylic nails (I missed getting my nails done). After I got those taken off (decided to save that $30 every few weeks for our house fund), they started breaking off. I find myself biting one every so often, but not nearly as much as I did for as long as I can remember.