Bad habits

I was thinking the other day about habits and how some are bad habits. I'll admit that I have bad habits, like chewing my nails or cracking anything that I can, i.e. knuckles and spine. I learned my bad habits from watching others, like my family, when I was younger. I am not sure about others, but my habits show up when I am nervous or when I am thinking, crewing my nails and cracking my joints, respectively. There are other habits that I know of but don't do that are worse habits, like smoking, and there are better habits, like drawing a picture. Now that I have thought about my habits, I wonder what other peoples habits are.