I am new to world of vaporizers and Ive become overly concerned about the safety of my current vape. Its a vapir one 5.0. My concern is that the plastic tube sometimes gets warped at the end. Does anybody know if this could cause me to inhale dioxins?? I emailed Vapir and they stated their tube was made from medical grade pvc and I have nothing to worry about. Of course they would say that. I know pvc can produce dioxins at high temperatures. I typically put the unit up to 400 F(this is the max it can go). Any help at all would be greatly appreciated.