The World Health Organization estimates that more than 4 million people die each year from the effects of smoking tobacco  . That number is increasing. WHO officials expect 150 million people to die from tobacco use in the next twenty years. Seven in ten of those deaths will be in developing countries. These numbers are frightening. Yet people around the world continue to smoke. It is not easy to stop smoking. However, doctors say you will live longer if you do stop smoking. You will feel better and look better. You will also protect the health of family members who breathe in your smoke. The American Cancer Society says there is not just one right way to stop smoking. It says that one method or a unit of methods may be successful. These include attending self-help programs or following  directions in a book. The group says any way to stop smoking that is legal, moral and effective is worth trying. This could include taking long walks or spending time in areas where smoking is not allowed. Also, you could eat a small piece of fruit instead of having a cigarette. The American Cancer Society says the sooner smokers stop smoking, the more they reduce   their chances of getting cancer and other diseases. It says blood pressure returns to normal twenty minutes after a smoker smoking the last cigarette. Carbon monoxide (CO) gas levels in the blood return to normal after eight hours. In a day, the chances of a heart attack decrease. In a year, the risk of heart disease is half that of a smoker. Most people who will die from smoking are from   _  .
big countries small countries developing countries developed countries