I get a pain in my chest too sometimes, turns out it was actually in my back. I was straining my back when ever I took a hit off my glass. In my old house I had a much higher (elevated) vape station and in my current house I use my bathroom sink counter(much lower). I kept getting these chest pains that were making me worry but after some stretching (no, not the glory hole) I immediately realized the pain was radiating to my chest from my mid back. I elevated my equipment a little bit and the pain stopped!