Youth vaping is rising and it's harming more than just lungs. 77% of young adults who vape never smoked cigarettes It impacts brain development, learning, and mental health Vape Nicotine Levels Explained: Is 2% Too Much? Vaping May Be More Dangerous Than Cigarette Smoking, Studies Show University Hospitals Teens who vape are more likely to become teens who smoke — and smoke more often Los Angeles Times