To incentivize quitting smoking, our app features special achievements that correspond with the length of the user’s streak: * *20 minutes after quitting*: the heart rate and blood pressure **drop** * *12 hours after quitting*: carbon monoxide level in blood returns to **normal** * *2 weeks to 3 months after quitting*: blood circulation **improves,** lung function **increases** * *1 to 9 months after quitting*: coughing &shortness of breath **decrease**. Structures in lungs begin to heal and clean the lungs, reducing a user’s risk of infection. This is critical in fighting illnesses that threaten lung health, such as bronchitis * *1 year after quitting*: **risk of coronary heart diseases is half** that of a smoker. Risk of heart attack **decreases** significantly * *5 years after quitting*: risk of mouth, throat, esophagus, and bladder cancer **is reduced to half**. Cervical cancer risk is now that of a nonsmoker! Risk of stroke falls to that of a non-smoker after 2-5 years * *10 years after quitting*: risk of death from lung cancer is **half that of a smoker** * *15 years after quitting*: risk of coronary heart disease **is roughly the same as a nonsmoker!** We would like these to show up as medals or coins that the user can collect, goading him to keep going!