While vaping is not risk free, it is less harmful than tobacco Our World in Data Health impact of E cigarettes: a prospective 3.5 year study of regular daily users who have never smoked Scientific Reports 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. E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA