20 minutes after quitting: Your heart rate and blood pressure drops.
12 hours after quitting: The carbon monoxide level in your blood drops to normal.
2 weeks to 3 months after quitting: Your circulation improves and your lung function increases.
1 to 9 months after quitting: Coughing and shortness of breath decrease; lung function improves, increasing the ability to handle mucus, clean the lungs, and reduce the risk of infection.
1 year after quitting: Your risk of coronary heart disease is half that of a smoker’s.
5 years after quitting: Your stroke risk is reduced to that of a nonsmoker 5 to 15 years after quitting.
10 years after quitting: The lung cancer death rate is about half that of a continuing smoker’s. The risk of cancer of the mouth, throat, esophagus, bladder, cervix, and pancreas decrease.
15 years after quitting: The risk of coronary heart disease is back to that of a non-smoker’s.