The use of ketamine, a common type of anesthesia, prevents brain cells from picking up "glutamate" — a protein which is essential for cell communication and survival. Like nitrous oxide, ketamine use should be limited to medical professionals. Using the proper amount of ketamine probably won't do much damage.
Well, if you lose brain cells, then I must be brain dead, or I had an overabundance to begin with, because I've had many, many joint surgeries, and my IQ has remained the same. Still in the high 70's lol