ANSWERS: 2
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You often inhale carbon dioxode without realizing it. Considering that you are constantly breathing out carbon dioxide, it is inevitable that you will re-inhale some of it. As long as there is enough available oxygen to be taken in, you will be perfectly fine.
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Well I actually did inhale some CO2 in chemistry once. It was emitted off of the dried ice and me being a little dumb decided to smell it. It jsut made my head feel tingly and I got a little dizzy and it made my nose burn some. I don't recommend breathing it of your own accord... funny feeling you get.
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