This one is pretty easy for me. The bad habit that I've been struggling with for years is boredom eating. Simply put, if I don't have something to do with my hands, I put food in them. My waistline certainly shows the results of it, as any eating when your not even hungry likely will, especially when the choices aren't the healthiest.
I come by the act naturally, as my mother has the exact same problem which is amplified at night. I'm not making excuses here, just stating the truth. I realize that I am entirely responsible for what goes into my mouth.
I would like to add that this April, my mom and I are celebrating 5 years without the worst habit I've ever had - smoking.