Yes, smoking anything is bad for your lungs....BUT if you vape, you don't get those nasty smoke particles,and the carbon dioxide and monoxide! Vaping lets the bronchodialators (or however you spell it) in cannabis work without being interfered with by smoke! It's the smoke that is doing damage, not the cannabis! My hubby is/was an asthmatic. No problems as long as he vapes! Over-doing it smoking (he does tobacco, too, the idiot!) can trigger an attack. - Granny:hippy: