I've used LSD about 10 times and I feel fine. I don't feel stupid or brain dead. I can think and react. If anything, I think the LSD helped me. It allowed me to see the world and myself differently. I don't use it anymore and I probably never will, but I don't regret doing it. Don't get so uptight about it. The brain is a muscle, use it more and it will get stronger. Don't be so hard on yourself.