in 20 minutes: Your blood pressure will return to normal.
in 8 hours: The carbon monoxide levels in your blood system will drop by half, and oxygen levels will return to normal.
in 48 hours: Your chance of having a heart attack will begin its long decline. All nicotine will have left your body. Your sense of taste and smell will return to a normal level.
in 72 hours: Your bronchial tubes will relax, and your over-all energy level will rise.
in 2 weeks: Your circulation will increase, and it will continue to improve for the next 10 weeks.
in 3-9 months: Coughs, wheezing, and breathing problems will dissipate as your lung capacity improves by 10%.
in 1 year: Your risk of having a stroke returns to that of a non-smoker.
in 10 years: Your risk of lung cancer will have returned to that of a non-smoker.
in 15 years: Your risk of heart attack will have returned to that of a non-smoker.