While it's true you could do permanent damage with improper, reckless use of tools and get, eg HPPD, the brain is also resilient, and, eg nitrous oxide abuse takes a long time to get to a level of causing harm (which it very much can through B12 depletion), but used properly (aka taking B12 supplements) it can be used without doing damage, giving you as many chances to fix your own brain as you can afford, if that is a route you want to take.