Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times any other gravity bong smokers cough up black phlegm? also vape and smoke tobacco but this is pretty common for me. had an x ray said my lungs are fine and oxygen How To Vape Without Coughing? Firefly Vapor What Causes Vape Cough (and 6 Ways to Stop It) Vaping360 What Does Vaping Do to Your Lungs? Johns Hopkins Medicine How to Inhale a Vape (Without Coughing!) Ashtray Blog E Cigarette Direct