https://www.medicalnewstoday.com/articles/321960.php
Not good for your lungs. And I have some pretty severe lung damage from my Sarcoidosis and the smoke or vape from anything gets me coughing. Its why even if I start up a hill in first place on our bike rides I am passed by everyone else, I am gasping for breath at the top. I never smoked beyond the few stolen ones in a field shared by a friend and I at age 10.
Why someone would with all we know about it choose to damage their lungs is insane. And vaping is no better, but they are known to blow up on you to boot. I just read an article how one blew up in someones face and they broke their jaw, lost teeth and had to have facial surgery.