MAPS: N2O and brain cells

["Lasse Tjo" <kul_helg@xxxxxxxxxxx>]

People keep talking about how bad N2O (nitrous oxide, laughing gas) 
is, that it kills brain cells et c. A doctor fiend of mine claims 
that the nitrogen somehow binds the oxygen in your blood stream thus 
preventing it from reaching your brain. My questions are as follow:

1) Is this true?

2) If so does this lead to brain damage?

3) If so, how extensive is this brain damage (i e how many brain 
cells die from a good snort of N2O compared to say, a punch to the 
head)?

4) Does the euphoric and sometimes psychedelic effects of N2O stem 
exclusively from lack of oxygen?

5) Is there any safe and harmless way of experiencing the euphoric 
qualities of N2O?

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