Smoker's Calc makes calculations which make you think! Give a few basic details of your smoking habits, and Smoker'sCalc will calculate: change in your estimated life span caused by smoking (or by qutting), amount of money you've lost on cigarettes (or you've saved by quitting), number of cigarettes you've smoked so far (or you've not smoked since you quit), amount of time you've spent on smoking (or you've saved by quitting).