By Tanner Garrity There’s a chance, assuming you’ve paid some casual attention to the rise of psychedelic-assisted therapy over the last couple of years, that you’re a little confused by the sudden ubiquity of ketamine treatment. How does your kindergarten teacher of a neighbor suddenly have easy access to a dance floor hallucinogenic? Why are colorful ketamine clinics with catchy names now popping up across your city — and in your Instagram ads? Well, while drugs like MDMA and psilocybin continue to seek FDA approval over the next few years, ketamine actually secured the distinction over 50 y…