I'm an avid user for many years, and when I used vaping pens for a couple weeks, I felt the damage in my lungs, it was uncomfortable. Burning oil was a little better but it still felt like the hot air was burning your lungs, and burning wax had a completely different problem where I literally felt wax on my esophagus and lungs the more I vaped. Never had any of these problems smoking from a bong. I'll stick to what has been tried and tested for centuries if not millenia.