If you're doing something you consider bad, or aren't doing something you want to do, then start (or stop) NOW. Don't wait for 2014. January 1 is not some magic date. Ever have a friend who's going to start that diet next month? Guess what a New Year's resolution is? It's not a commitment. It's an excuse not to do something now.
I'm just as guilty as anyone of doing this, but let's not pretend "what I'm going to do in 2014" isn't utterly meaningless unless it's something you are and have been working towards that can't happen until 2014 because it's just that damn hard.