Quitting smoking has both short-term and long-term benefits for health. In the short term, cessation can lead to improved lung function, better circulation, and a decrease in withdrawal symptoms within days. Long-term effects include a significantly reduced risk of heart disease, lung cancer, and other related illnesses. After several years, former smokers can achieve health levels comparable to non-smokers. Additionally, the benefits extend to enhanced quality of life and increased longevity, making quitting one of the most impactful lifestyle changes for overall health.