>>2 the worst habits are the ones we can do easily and for free I think. I'm not a big fan for what I think of as 'made-up disorders' but you could have said I had Trichotillomania because I used to subconciously pull out my hair when doing anything that didn't require both hands. It was never noticeable because rather than just straight pulling hair out I'd work on one for quite a while, gently tugging until the hair eventually came out (excuse the indepth explanation :3). The only way I can avoid doing it is through concentrating on not doing it, or when I can't put in the effort to be vigilant, gelling my hair.