When smokers quit, within twenty minutes of smoking that last cigarette the body begins a series of changes.

At 20 minutes after quitting:

• blood pressure decreases
• pulse rate drops
• body temperature of hands and feet increases

At 8 hours:

• carbon monoxide level in blood drops to normal
• oxygen level in blood increases to normal

At 24 hours:

• chance of a heart attack decreases

At 48 hours:

• nerve endings start regrowing
• ability to smell and taste is enhanced

At 2 weeks to 3 months:

• circulation improves
• walking becomes easier
• lung function increases

1 to 9 months:

• coughing, sinus congestion, fatigue, shortness of breath decreases

1 year:

• excess risk of coronary heart disease is decreased to half that of a smoker

At 5 years:

• from 5 to 15 years after quitting, stroke risk is reduced to that of people who have never smoked.

At 10 years:

• risk of lung cancer drops to as little as one-half that of continuing smokers
• risk of cancer of the mouth, throat, esophagus, bladder, kidney, and pancreas decreases
• risk of ulcer decreases

At 15 years:

• risk of coronary heart disease is now similar to that of people who have never smoked
• risk of death returns to nearly the level of people who have never smoked