No matter what your age or how long you have smoked, giving up cigarettes is the ticket to a longer life. Consider that just 12 hours after your last cigarette, the carbon monoxide level in your blood returns to normal. A year after you've quit, your risk of heart disease is half that of a smoker's.
Critical Care Medicine, Pulmonary Disease
Hospice and Palliative Medicine, Pulmonary Disease
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