I lived around drugs from the time I was about 10, until I was about 25. I did many drugs myself, and spent time with many people who did a lot of drugs. I have also worked in various drug and alcohol treatment centers for five years. There are many drugs that I would highly recommend NOT doing. LSD is one of them. I had 3 friends who did it who are now permanently fucked up as a result. While LSD may not do any brain damage, I believe it does some sort of psyche damage. There is a risk that you may not ever leave the trip. One of my friends had this exact thing happen. 15 years ago she took just one hit, and she is now schizophrenic and needs to live in a home and take a grip of medications, and can't even watch t.v. shows, movies, or carry on conversations because her short term memory is completely shot.
Working in treatment centers, I could always tell who the acid heads were. They would kind of have this blank stare seemed completely incapable of developing mentally beyond about a 15 year old. Sometimes they seemed like an adult, but then when I would sit down and really talk to them, I'd feel like i was talking to someone who mentally really hasn't made it out of the teen years.
I never did LSD, and never wanted to after seeing what it did to my friends. Sure theres a good chance you will take it and come out fine, but the risk of utter madness and psyche destruction makes it not worth it to me.
There are other drugs that are much safer and have effects very similar to LSD. And they are natural. Mushrooms, Mescaline, Morning glory seeds, ayahuasca, DMT, bufotenin, amanitas, ergot... the list goes on and on. Research any of these substances and you will see.