Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis Vaping vs Cigarettes Health Impacts Compared Don't be foolede cigs or vapes may be less harmful than cigarettes, but less harmful doesn't mean safe. Vapes can contain harmful substances including nicotine, heavy metals like lead, volatile organic compounds and 2020 Update: Is Vaping More Dangerous Than Smoking? E cigarettes contain hazardous substances, addictive and harmful Is Vaping Better Than Smoking? American Heart Association