24 hours Carbon monoxide is eliminated from the body. The lungs start to clear out mucus and other debris. 48 hours Nicotine is no longer detectable in the body. The ability to taste and smell is improved. 72 hours Breathing becomes easier as the bronchial tubes relax.
Energy levels increase.
2-12 weeks Circulation improves throughout the body, making walking easier. 3-9 months Breathing problems such as coughing, shortness of breath, and wheezing improve. 5 years Risk of a heart attack falls to about half that of a smoker. 10 years Risk of lung cancer falls to about half that of a smoker. Risk of a heart attack falls to about the same as someone who has never smoked.