And if you think LSD can have damaging effects, look at Dr. LSD- he lived to be 102, and he took LSD in mammoth doses. The first time he took LSD(when he discovered it), he did not realize how small its active dose is, so he took something like 100x the standard dose(several milligrams). LSD is completely safe physically, it's impossible to overdose or cause brain damage of any sort.
Hmmm, a sample size of one, eh?