This shit is also very destructive. Maintain a casual relationship, because if abused it is a real damaging drug just like MDMA. MDMA is considered an extremely safe drug in moderation, but taking it every weekend popping more than one or two, it leads to Serotonin Syndrome, because MDMA heavily interacts with Serotonin receptors in your brain. Ketamine has been known to cause almost mild Alzheimers symptoms of brain damage to people. Memory retention is weakened to the point of almost being elderly, you can't remember things and it's hard to learn new things.
I know people in my life with brain damage and it's very hard for them to do day to day things and remember things. It's not a nice way to live, it's very sad and I wouldn't wish it on anyone.
http://www.reuters.com/article/us-ketamine-abuse-idUSTRE5AJ40T20091120
That guy is a bullshitter, I have read in other places with proof from close associates of him that know him that he was abusing Ketamine at around 3-4g and with 8-10 MDMAs. He has his body damage to blame from his abuse of Ketamine and MDMA. TL;DR - If you abuse Ketamine, MDMA etc. like any drug you will cause damage to your body, don't be that person 'Oh, it will never happen to me...' cause when it does you will be the last to laugh.
Also what is your logic? Let's recreationally take 'anesthetics'... just seems very redundant of something with a legitimate medical use. You realize the anesthesists are the highest paid medical profession with upwards of $350k year salaries, because they have to do massive amounts of training (more than standard GPs) and they undertake massive legal and ethical responsibility in regards to their administration of that drug. Why not let a professional do it? You don't know if you are safely dosing your body.
P.S Kids stay away from this shit, just smoke weed.