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Um, 0.5 is 0.5% by volume, not 50%. That said, a level of 0.5 (or 500 in old units) DOES take practice, if you're conscious and walking around. Some people actually cruise at that level and start withdrawal by the time they hit 200/0.2.
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The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi 
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