i notice changes in my personality after i had done rock for like a month straight on and off skippin a couple day betwen...so i do think that has major affects on the brain ,but my uncle has smoked it since he was 16 he is 33 or so now and he acts the same as always as i see it...
just last night i seen an old friend ,that i have literally known all my life ,well he alot older but still a friend i guess ,but he is MAJOR alcaholic ,lives on the street now,he didnt even know who i was ....its amamzing ,if only he would take my advice