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Of course. I even breathed 160% oxygen (100% O2 at a 1,6bar pressure (6m under water), which makes it like breathing 160% oxygen). You can only do that for 15 minutes, than change to some other gas, like air for 5 minutes, or you will get central nurveous system poisoning.
I used to use 100% O2 for decompression in diving, now I use Nitrox 50 instead and switch to it on 21 meters while ascending. It's safer than pure O2.
Besides popular believe that breathing pure O2 makes you feel better, I do not think it makes any difference.
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