Hmmm....banging a pencil on the table, checking to see if the door is locked four times in a row, turning the tv frequently, but not interested in watching it, leaving the computer on all day, what are some of your habits?
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I bite my nails. It's horrid, I know!
You would think that 3 years of braces (when I was an adult, no less) would have cured me of this habit, but you'd be wrong. LOL So when I want to appear grown-up (special occasions, etc) I use glue-on nails. Luckily, I've gotten pretty good at that. 
This is gross, but picking pimples on my face, or my husbands.
It's like one of those strange addictions. lol and 
Hummmm... the habit I would like to see go away is working. LOL (Okay I really don't want to stop my work ethic, just want to retire, so I can have more time to enjoy other things).
Eating candy that isn´t really tasty... I know, I´m probably a sugar addict