That is 100% false, ask any doctor, EMT, or field medic. You CANNOT die from "choking" on a hit, as there is NOTHING obstructing the airway that wouldn't disappate shortly. As I stated, the WORST that can happen is that they'll pass out and wake up with a headache and sore throat. If the throat is overly-irritated by the smoke, it may, in fact, close off. However, it WILL reopen, and breathing WILL resume shortly after loss of consciousness. This occurs because, when the throat constricts, the majority of people panic. By panicking, they are, unknowingly, making the problem worse. The trick is to relax and practice diaphragm control (slow, controlled breaths from your stomach region. Even if it doesn't work initially, keep trying until your mind and body calm down a little. It WILL end. Let me reiterate: IT IS PHYSICALLY IMPOSSIBLE TO DIE FROM "CHOKING" ON A HIT. That isn't to say that some dumb shit out there won't seal off a gas mask, get it rolling, and have a hell of a bad time, but if they can get the mask off, they WILL, eventually, be just fine.