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20 minutes: blood pressure and pulse return to normal.
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8 hours: nicotine and carbon monoxide levels in blood are halved.
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24 hours: carbon monoxide will be eliminated from your body. Your lungs will have started to clear out the tar that's been clogging them up.
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48 hours: no nicotine left in your body. Taste and smell are greatly improved.
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72 hours: breathing becomes easier. Energy levels increase.
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2-12 weeks: circulation improves. Exercise is easier.
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3-9 months: coughs, wheezing and breathing problems improve.
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5 years: from 5 to 15 years after quitting, stroke risk is reduced to that of people who have never smoked.
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10 years:
risk of lung cancer drops to as little as one-half that of continuing smokers. The risk of cancer of the mouth, throat, esophagus, bladder, kidney, and pancreas decreases. The risk of ulcers decrease.
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At 15 years: The risk of coronary heart disease is now similar to that of people who have never smoked, and the risk of death returns to nearly the level of people who have never smoked.