As soon as smokers quit, their bodies begin to repair themselves. Within eight hours of the last cigarette, carbon monoxide and oxygen levels return to normal. Within a few days, the mucus clogging airways is broken up and eliminated. Within a few weeks, circulation, smell and taste improve dramatically. After one year, risk of lung cancer and stroke decreases. In two years, risk of heart attack returns to normal. After 10 years, life expectancy returns to normal.

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