Halon itself is not poisonous, it simply displaces oxygen. Breath enough in, and you'll eventually suffocate if you don't move to fresh air and force the halon out of your lungs. Other than that, there should be no ill effects.Last year when I had to use my fire bottle, when I went to get a new one halon was no longer an option. I also forgot to hold my breath before I pulled the handle but I survived.
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