For what it's worth, I've had batteries vent right in front of me many times, and it has never caused me any immediate health problems. I'm not advocating this kind of carelessness, just letting you know that catching a whiff of the fumes, although not a good idea, probably won't kill you. Of course, if you already have a medical condition, the effects could certainly be amplified. Also, the psychological effect (paranoia due to the unknown repercussions) can also cause you to feel very ill. In any case, a trip to the doctor is never a bad idea.
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