Days Since can help you break any bad habit.
Create a counter for each habit that you are trying to get rid of. If you are trying to quit smoking, create a counter and set the last time you had a cigarette. The app will show you how long its been since you smoked for the last time. Tracking your progress will help you stay motivated.
Whenever you want to smoke again, open Days Since and check your progress. You dont want to reset that counter, do you?