This is from the American Lung Association
20 Minutes After Quitting:- Your heart rate drops to a normal level.
12 Hours After Quitting:- The carbon monoxide level in your blood drops to normal.
2 Weeks to 3 Months After Quitting:- Your risk of having a heart attack begins to drop.
- Your lung function begins to improve.
1 to 9 Months After Quitting:- Your coughing and shortness of breath decrease.
1 Year After Quitting:- Your added risk of coronary heart disease is half that of a smoker's.
5 to 15 Years After Quitting:- Your risk of having a stroke is reduced to that of a nonsmoker's.
- Your risk of getting cancer of the mouth, throat, or esophagus is half that of a smoker's.
10 Years After Quitting:- Your risk of dying from lung cancer is about half that of a smoker's.
- Your risk of getting bladder cancer is half that of a smoker's.
- Your risk of getting cervical cancer or cancer of the larynx, kidney or pancreas decreases.
15 Years After Quitting:- Your risk of coronary heart disease is the same as that of a nonsmoker