good advice...
I found that I definitely have some cognitive issues from massive hallucinogen intake, no doubt. But because I never got into hallucinogens, truly, until I was older, I believe that I am able to integrate these changes into who and what I am better than I could have when I was 18.
Just what kind of cognitive issues? As brewmaster said, verbal ability does seem to be somewhat reduced...also I have found that theres a lag sometimes between my hearing what someone says and my processing of what they said of a second or two....
However, this may not have entirely negative implications. An older academic such as myself, whose world was steeped words and concepts, may find that heavy psychedelic use alleviates the left brain hyper-rationality dominance, and allows a lot of perception in that has always been filtered through the
screen of verbal concepts.
Most of the type of learning you will do in college is two kinds;
a) rote memorization
and
b) deductive reasoning
these are both classic 'left brain' processes and they will be slowed by psychedelics
but the 'other' kind of thinking, which uses your other hemisphere, 'right brain' thinking, may be amplified, and greatly.
This pertains to art and music and other non-linear activities, and if all the right brain had to offer was artistic appreciation, that would be great...
but the real gift of psychedelics for me was the manifestation of what is called 'inductive reasoning'...this is the part of yuor brain that already knows most of the answers, but doesn't speak to you in words...it speaks shamanistically, in concepts.
So, no, you're not going to become a drooling retard, but you need to develop your basics first ( deductive reasoning, memory, etc.) so that you are able to USE what they give you.