Mrs. Angelo suspects that her student Hassim has been smoking tobacco. Which of the following is a fact that she might share with him to help persuade him to quit? Nearly half of all smokers will develop heart disease within the first year of smoking. Smoking risks include not just cancer of the lungs, but also of the throat, bladder, and esophagus. Using e-cigarettes or vape pens is a much safer alternative to traditional tobacco. Within 12 hours of quitting, carbon monoxide levels in the blood return to normal.