Please speak slowly and clearly. Thanks
If you smoke, you are one of more than a billion people in the world today who do. This statistics is especially alarming, since inhaling is quite dangerous. You might feel healthy now, but chances are you will soon be unhealthy. Smoking causes many different kinds of serious illnesses, such as lung cancer and heart disease. People who smoke usually know the consequences of their choice, but they continue to do it. In the United States, many people start before they are eighteen; some as early as fifteen. They are pushed by curiosity or peer pressure, and by age thirty-two they are usually addicted. Some try to kick the habit, but the effort to quit is undeniable, even if you are knowledgeable about the risks.
The majority of people in the world does not like smoking. These non-smokers are very concerned about the long-term effects on people’s health from tobacco fumes. They have helped pass laws to restrict smoking in public places so as to decrease breathing harmful “second-hand smoke”. If you avoid lighting a cigarette, you are wise, and will probably live a happier life.
I read it as "The majority of people in the world *do* not like smoking".
I think "does" might be grammatically correct, but it seemed unnatural coming out of my mouth. So I just spoke what felt natural to me.