I have only one real vice and that is ice cream.  My favorite is Moosetracks by almost anyone or Michigan Deer Traxx and Caramel Deer Traxx by Hudsonville in Michigan.  The habit I have developed over the years is eating it after bedtime.  I will wake up an hour our two after going to bed and get myself a small bowl which is quite insane since I have already brushed and flossed and even though I rinse with water afterwards, I can just imagine what it is doing to my teeth!  Bad habit that tastes so good!