Smoking cessation can significantly improve cardiovascular health by reducing the risk of heart disease and stroke. When an individual quits smoking, the heart rate and blood pressure begin to normalize, leading to improved blood flow and oxygen delivery throughout the body. This reduction in harmful substances allows the vascular system to regain strength and flexibility. Additionally, quitting can lower cholesterol levels and increase physical fitness, decreasing the overall risk of cardiovascular complications. Long-term, former smokers can regain lung function and enhance their overall well-being.