Doctors have linked vaping to a rare, incurable lung condition called obliterative bronchiolitis, often referred to as popcorn lung. The disease permanently scars and narrows the lungs' airways, causing lifelong breathing problems. Smoke Screen Blogs CDC E Cigarette Dangers City of Colorado Springs Vaping harms your health Cancer Institute NSW Why is the Royal College of Physicians concluding e cigs reduce harm while ignoring the substantial associations between e cigs and actual disease? Stanton Glantz blog Effects of brief exposure to misinformation about e cigarette harms on twitter: a randomised controlled experiment BMJ Open