The only similar experience I have had was huffing freon maybe 20 times when I was in my twenties. Some yahoo friend said they used to do it all the time. Maybe all it did was starve the brain of oxygen. I don't know. When I was a teen we cleaned my buddies dad's dental office and of course when we were done sat in the chairs and cranked up the nitrous oxide. Supposedly safe but I cranked it way up and would sit for an hour or two. I am sure I have killed brain cells or whacked them pretty good over the years with drug use. But the brain is plastic and grows new connection, new receptors, and even new neurons. Long term sobriety heals things.

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