Vaping refers to the act of inhaling and exhaling aerosol, often called vapor, produced by an electronic cigarette or similar device. These devices heat a liquid that usually contains nicotine, flavorings, and Some E Cigarette Flavors May Be More Harmful Than Others The Atlantic Vaping Essential Oils: Hidden Health Danger You Need to Know About American Lung Association Understanding the Hidden Health Risks of Vaping UL Research Institutes Thousands of unauthorized vapes are pouring into the US despite the FDA crackdown on fruity flavors AP News The truth about e cigarettes IQAir International