Ask an Expert Youth Vaping: What You Need to Know Staying Healthy: E Cigarettes Harm Lungs Flavored e cigarettes are causing permanent lung damage. E cigarettes heat liquid chemicals into an aerosol designed to be inhaled deeply. That delivery method matters. Like a medical nebulizer, vaping efficiently carries substances straight Some e cigarettes contain chemicals that cause popcorn lung Vox COPD and Vaping: Understanding the Risks and Long Term Effects Can vaping damage your lungs? What we do (and don't) know Harvard Health