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Re:Drugs and the Meaning of Life (2011) by diydsp on Monday July 01, 2013 @01:59AM (#5968963)
During an undergrad research project in a hospital, I had access to a medical library and found a few articles on persistent visual tracers following LSD use. I can't find them now, but I turned this up in the British Journal of Psychiatry

"A chronic impairment of colour vision in users of LSD." http://bjp.rcpsych.org/content/140/5/518.short

Re:Drugs and the Meaning of Life (2011) by Nursie on Monday July 01, 2013 @06:58AM (#5969810)
A small number of users do experience HPPD, yes, but I'm not convinced there are thousands of shambling, brain-fried zombies from this and this alone.