In addition to the fine answers already given, I would suggest that stomach acid has certainly killed people through aspiration pneumonia.
Aspiration, in this case, refers to breathing, not hopes and dreams. In a medical sense, aspiration usually refers to breathing in a liquid. If you’ve ever coughed and choked from “something going down the wrong pipe” or taken in water and nearly drowned, you’ve aspirated.
Pneumonia is an infection of the lungs. If you breathe in something astringent, it can damage your lungs, allowing an infection to move in. This is especially true if there are bits of food in your stomach acid. For people with weakened immune systems, it doesn’t take much for them to aspirate, get infected and pass away.
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