The Chemistry of Vaping ChemistryViews Radiologic, Pathologic, Clinical, and Physiologic Findings of Electronic Cigarette or Vaping Product Useassociated Lung Injury (EVALI): Evolving Knowledge and Remaining QuestionsRadiology Vaping and Popcorn Lung Medicine.com 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.