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Is 100% O2 really a safe decompression gas?  Oxygen is a 
vasoconstrictor and it would make sense (or seem to) that this would 
cause it to diminish the effect of off-gassing N2.  Is the time saved 
during decompression worth the potential hazards involved?  It appears 
that other EAN mixtures are adequate while requiring a stop that is not 
significantly longer than one in which 80-100% O2 was used.

Of course real and ideal are very different, so input based on 
practical expericance would be very helpful.

I'm not being a 'deco weenie' or trying to purport that O2 is not safe, 
I just have lots of questions - Allen

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