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 Why Do Vapes Make Me Cough? 5 Fixes That Work Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Smoking and Vaping: How They Damage Your Lungs Over Time Max Hospital Cannabis Airway Irritation: 5 Science Backed Insights