Please choose the correct ending to complete the given sentence: Health: [header] How to maintain a healthy heart [title] Stop all forms of tobacco use. [step] Using tobacco increases your risk of heart damage. Both tobacco and nicotine contain many chemicals that cause harm to your blood vessels and heart, and this results in atherosclerosis, which is a plaque build-up of cholesterol, fat, and calcium in your vessels that can cause your arteries to narrow, decreasing blood flow.

Ending1: To prevent this, stop smoking, smoking and don't smoke. [substeps] Smoking onions in your tobacco products is also associated with heart defects. Ending2: Tobacco, however, is also associated with kidney disease in chronic cases and cancer. [substeps] If you have chronic heart problems, your arteries may have become blocked because of your age or health. Ending3: [substeps] The carbon monoxide in cigarette smoke has also been linked to mortality and morbidity. It interferes with oxygen, so your heart is pressured into supplying additional oxygen to compensate. Ending4: [substeps] Nicotine thc, high blood pressure, and other tobacco products also increase your risk of heart problems. Quit smoking, or quit practicing or rebooting your tobacco.

Answer format: ending1/ending2/ending3/ending4