Final answer:
Smoking cessation reduces coronary artery mortality in stable angina by approximately 50%.
Step-by-step explanation:
Smoking cessation reduces coronary artery mortality in stable angina by approximately 50%. For example, by one year after quitting smoking, the risk of heart disease drops to only half of that of a continuing smoker. This reduction in coronary artery mortality is due to the fact that smoking damages the blood vessels and contributes to the formation of plaque, which can lead to reduced blood flow to the heart.