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. Does vaping (using e cigarettes) make a difference to our health and are there harms with second hand vaping? iHealth Facts Vaping Risks and Dangers During COVID Toxicological Effects of E Cigarettes on Cells, Animals, and Humans and Mechanisms of Toxicity Springer Nature Link