Smoking
According to the Centers for Disease Control (CDC), nearly 25% of high school students use some kind of tobacco product, and nearly 4,000 kids under age 18 try their first cigarette every day. In fact, 9 out of 10 smokers had started smoking before they finished high school. This means that if children can stay smoke-free in school, they will probably never smoke.
More than 90,000 people die each year from heart diseases caused by smoking. Among young people who would otherwise have a very low risk of heart disease, cigarette smoking may cause as many as 75 percent of the cases of heart disease. And, the longer a person smokes, the higher the risk of heart disease.