Disease

Tobacco is one of the leading causes , and till a few decades ago, medical health reports have been showing, that smoking it, is bad, many people have died from smoking tobacco, over the past few centuries an amount of 100million died from illness caused by smoking tobacco, but in just this century alone, ONE billion people are going to die from it, an average of 6 million people die annually, an estimation of 2.1 million people will die from cancer, that is caused by the use of tobacco products, most of them which will occur in developing countries.

Though everyone knows that smoking is critical to your health, yet teenagers still use tobacco products,not only is it critical to their health, but also their brains, a teen's addiction to nicotine, causes the prefrontal cortex to be less active, which means it's effects their thinking, for example telling what's right and what's wrong.

Use of tobacco products causes diseases, such as lung, heart, cancer, blindness, diabetes, impotence , gum diseases, also increases the brain bleeding risk, at the same time, it affects how long you will live, people who smoke are twice as much exposed to these diseases.
If you're a smoker, who hopes to not go through the rest of your life with these consequences, quit now.