Vapes don't produce harmless water vapor. They can contain addictive nicotine, cancer causing chemicals like acetaldehyde and formaldehyde, as well as heavy metals that don't belong in your body. Live Vape Free is Vaping vs Smoking: Effects and Tips for Protecting Your Lungs Max Hospital Emissions from Electronic Cigarettes: Key Parameters Affecting the Release of Harmful Chemicals Environmental Science & Technology Is vaping more dangerous than smoking? UK Addiction Treatment Centres Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times