Stop that. You know what it is: it's that thing that holds you back, gets you in trouble, or is just plain unhealthy. We all have bad habits. Pick a small one and stop doing it for a week, or even a day. If it feels good (and it will, because you know you shouldn't be doing it), stop for a little longer. It's said that habits are made or broken in 30 days. If you can make it to the one-month mark, you could really say goodbye to that troublesome behavior. How nice would that be?