Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to prevent cardiovascular disease [title] Stop smoking. [step] So simple, and yet so difficult for those who battle addiction to cigarettes or other tobacco products. The first thing a doctor who is determining your cardiovascular disease risk will ask is likely to be " do you smoke? ", and his first advice if you reply in the affirmative will be to quit.

Ending1: [substeps] Chemical compounds in tobacco contribute to atherosclerosis (narrowing of arteries), while the carbon monoxide in smoke replaces some of the oxygen in your blood. These two things force the heart to work harder and make arteries much more susceptible to blockage. Ending2: Remember that you will eventually follow through with this friend, so if that is the outcome you want, consider it a failure. If you know you are selfish, that is okay, but remember that becoming addicted is a continual battle against mental health. Ending3: Smoking should also be taken seriously by your doctor as it can cause other problems such as cognitive decline, alcoholism, and depression. Taking up a hobby or running clubs, and taking up weight or is more convenient to you will help you support this lifestyle. Ending4: If and when you quit smoking, the doctor will have specific concerns about the combination. For example, it is common for addicts to keep too many cigarettes in their car or quit smoking post college years and therefore they need to stick to these nicotine options.

Answer format: ending1/ending2/ending3/ending4