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It doesn't turn to concrete in your body. This is the ash distribution:
Once you start inhaling volcanic ash you are fucked. Your going to suffocate. My description of "concrete" is just a way to explain that your lungs can't filter volcanic ash. Planes can't even fly through it. If we are talking about a supereruption its a minimum of 240 cu. miles of material ejected into the atmosphere, that's the minimum amount.