Vaping has become common, but it's important to know what you're inhaling. Many e cigarettes contain nicotine, heavy metals like nickel and lead, and chemicals that can harm your lungs and overall health. The Dangers of Vaping and Oral Nicotine Use Among Youth E cigarettes & Vaping Positive Choices Electronic Cigarette Use and Risk of Hypertension: The Hispanic Community Health Study Study of Latinos (HCHS SOL) ScienceDirect E Cigarettes and Lung Health American Lung Association Vaping and E Cigarettes Causing Outbreak of Respiratory Illnesses, Other Severe Health Problems, and Deaths Sommers Schwartz