Brain damage and possible death from LSD? Granted, the undercover agent claimed to have accidentally ingested about 1000 doses at 60 mcg's each (a thumbprint dose, basically), but even with that quantity, that wouldn't kill a person. He was in a wrong setting, and was unprepared for the experience, so of course he would have a hard time integrating afterward. Claiming LSD is toxic and transforms frequenters of it into borderline vegetables is pure misinformation.
"'Most men will not swιm before they are able to.' Is not that witty? Naturally, they won't swιm! They are born for the solid earth, not for the water. And naturally they won't think. They are made for life, not for thought. Yes, and he who thinks, what's more, he who makes thought his business, he may go far in it, but he has bartered the solid earth for the water all the same, and one day he will drown."
— Hermann Hesse