20 minutes

Your heart rate drops.

12 Hours

The carbon monoxide level in your blood drops to normal.

2 weeks to 3 months

Your heart attack risk begins to drop. Your lung function begins to improve.

1 to 9 months

Your coughing and shortness of breath decrease.

1 year

Your added risk of coronary heart disease is half that of a smoker’s

5 to 15 years

Your stroke risk is reduced to that of a nonsmoker’s.

10 years

Your lung cancer death rate is about half that of a smoker’s. Your risk of cancer of the mouth, throat, esophagus, bladder, kidney, and pancreas decreases.

15 years

Your risk of coronary heart disease is back to that of a nonsmoker’s and your risk of death returns to nearly the level of people who never have smoked.