What you should know about vapes and e cigarettes 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 Vaping: The Small Habit That Hits Harder Than You Think Maryland Physicians Care If you don't vape, don't start. Most e cigarettes contain nicotine, which is highly addictive and harmful to your health, especially for teens, young adults and those who are pregnant. Learn more about