Already got coronary heart disease quit smoking useful, it is recommended to actively quit smoking, to delay the progress of coronary heart disease, reduce the risk of heart attack and death, has an important role. Harmful substances in cigarettes, such as nicotine, nicotine, etc., can act directly on the heart and blood vessels, causing vascular spasm and contraction, causing damage to the vascular lining, and promoting the formation of atherosclerosis, as well as increasing myocardial oxygen consumption. Therefore, smoking is an independent risk factor for the occurrence and development of coronary heart disease. Although you already have coronary heart disease, actively quitting smoking is important for preventing the continued progression of coronary heart disease and reducing the risk of myocardial infarction. Among patients who have already suffered from coronary heart disease and myocardial infarction, quitting smoking has a significant effect on reducing mortality. It is never too late to stop smoking, but it is better to do so before serious health damage occurs. Therefore, even though you already have coronary heart disease, there are still great benefits to quitting smoking, and it is recommended that you build up your confidence and actively quit smoking.