Vaping vs Smoking vs IQOS: Which is Least Harmful? YouTube Vaping May Be More Dangerous Than Cigarette Smoking, Studies Show University Hospitals Many young people who vape did not smoke cigarettes before they started vaping. But young people who vape are more likely to start smoking cigarettes than those who never vape. For help 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