Most importantly, smoking causes big health problems. For example, smoking makes it harder to breathe if a person has illnesses like asthma. Smoking hurts a person's lungs, causing diseases like cancer, etc.

To begin with, smoking costs a lot of money. Smokers may also have to spend more on medicine and doctor visits. Another reason not to smoke is that it is bad for people who do not smoke, Secondhand smoke is a serious public health risk. It isn't polite for a person to smoke in front of a nonsmoker. Besides, nonsmokers usually don't like the smell left in rooms, cars, or even on a smoker's clothes!

So if you don't smoke, don't start. If you do smoke, it's time to give it up.