What is vaping? What are e cigarettes? Is it as harmless as it is made out to be? The truth is many e cigarettes contain nicotine, a highly addictive substance that can affect brain Vapes and e cigarettes often contain nicotine, heavy metals, and carcinogensand can harm developing brains, affect mood and learning, and lead to lasting lung damage. Just one hit can start an addiction. What Is Vaping? Expert Guide Infographic: What's In A Vape PHE Canada Word of the year: vape, says Oxford Hartford Courant