I really like how simple the design is and how easy it is to put in data but I wish there was a way to edit the time stamp on the input in case you forget to count a cigarette at the time you smoke it. It seems picky but I like to have an accurate gauge of the intervals at which I smoke. It would be nice to have a feature that showed an average of how long I go between cigarettes throughout the day, week, month, and so on in addition to how many I smoke.