Citation: Zorba. "Numbness: An Experience with Nitrous Oxide (exp56536)". Erowid.org. Oct 9, 2006. erowid.org/exp/56536
I used N2O for a few days in a row - about 4-5 balloons each time. I ended up with tingling/numb fingers & lips for about 2 weeks, which was slightly alarming to say the least.
I think that the information about 'numbness in extremities' is understated.
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