E cigarettes contain hazardous substances, addictive and harmful World Tobacco Day E Cigarettes Vaping Can Be More Harmful Than Regular Cigarettes Can Cause Lung Injury Experts Say Who Vapes? Correlates of E Cigarette Use in U.S. College Students Nova Science Publishers A decade ago, the most frequent opinion among smokers was that vaping was less harmful than tobacco. But ten years on, the opposite is true: over a third say that vapes are Is Vape Smoke Harmful? What's The Difference Between Smoke & Vapor?