Do you have bad habits?

I have a VERY bad habit of chewing on things and always have. I'm not as bad as a puppy with unattended slippers, but I do find myself chewing on random things and have to wrestle them off myself. XD Mostly it's hard plastic stuff too, which is obviously not good to be chewing on... I used to do it to all my pencils and pens, disposable cups (like coffee cups xD), straws, and pretty much anything else, ahaha. It's so bad.

Do you have bad habits that you haven't grown out of?