The first version was on the White Album , recorded in 1987. It has provided years of reliable relief from pain.
Nitrous oxide cuts off the flow of oxygen to the brain.
It doesn't interfere at all with the body's mechanism of absorbing oxygen. I am not an advocate of the use of nitrous oxide for recreational purposes, but I do hate it when people spread misinformation. FOR A FACT is wrong. Nitrous is available in VA, and legal. Remember, if you purchase nitrous oxide, you are likely to be supporting people who care nothing about, and contribute nothing to the Phish community.