Good thread! I like being honest about these things and seeing I'm not the only one with certain issues.
It's kind of comforting!
My bad habits are...
-spending WAY too much money on make-up
-putting myself down, mostly physically because I hate my appearance
-biting my nails when I'm stressed out
-being argumentative for no real reason
-being a bit of a masochist and asking people to tell me things I don't want to hear (e.g. asking about my boyfriend's ex-girlfriends)
-collecting and saving useless crap, rationalizing that "I might need it later" (e.g. old magazines) and not being able to let go of childhood things I obviously don't play with anymore and am clearly too old to have (e.g. stuffed animals)
-food ruts because sometimes I eat healthy and then there are weeks or months where I eat like crap (not fast food or anything but just too many carbs, too much bread, etc.)
-stubbornness, big time -- I always want to be right!