"Quit smoking" provides an overview with some statistics and their health benefits.
        In addition, you can set a goal (What will you do with the money saved?) And write a diary.

Overview: statistics on when you quit smoking, days without smoking and cigarette savings, money and time
Health: progress of benefits when you stop smoking (breathing, cancer, ...)
Diary: here you can write whatever you want. Can be backed up to a sdcard.