The document outlines the chronological health benefits of quitting smoking. Within minutes of quitting, the body begins to heal and heart rate and blood pressure drop after 20 minutes. After 12 hours, carbon monoxide levels in the blood return to normal. Lung function and circulation improve within 2 weeks to 3 months. After 1 to 9 months, cilia function returns to normal in the lungs, reducing infection risk. The excess risk of heart disease is halved after 1 year and stroke risk becomes equal to a non-smoker within 5 to 15 years. After 10 years, the lung cancer death rate is half of a continuing smoker and after 15 years, the risk of heart disease equals a non-smoker.