20 minutes – Blood pressure and heart rate returns to normal. 8 hours – Oxygen levels in the blood return to normal, reducing your chances of having a heart attack. 24 hours – Carbon monoxide leaves the body and the lungs start to clear out mucus and debris. 48 hours - Nicotine is totally eliminated by the body, and your sense of taste and smell begin to improve.
72 hours – Lung capacity increases, making breathing easier, and increases energy levels. 2-12 weeks – Circulation improves and the lungs become around 30% more efficient, making exercise easier. 3-9 months – Breathing problems such as coughing, shortness of breath, and wheezing improve. Energy levels continue to increase. 5 years – Chances of getting cancer significantly reduce. The risk of heart attack falls to about half that of a smoker. 10 years - Pre cancerous cells are replaced by healthy cells. Risk of heart attack falls to about the same as someone who has never smoked.
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