Health Effects of Vaping Smoking and Tobacco Use CDC E Cigarette Brands Are Skirting the Rules About Health Warning Labels on Instagram, Study Finds The Brink Boston University 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. While vaping is not risk free, it is less harmful than tobacco Our World in Data