it's not like it would be that hard to mistake something for
an acid trip, many of the things you experience on acid
are classic symptoms of psychological disorders -- depersonalization
and hallucinations are some obvious ones. general consensus
on "acid flash-backs" are that they are a form of Post-Traumatic
Stress Disorder, where simply the intensity of taking acid marks
it as a traumatic event that you get sucked back into like a vet
gets flash-backs of vietnam. in the story a couple posts up
of someone getting nearly knocked out having a "short acid trip,"
that sounds like something that can happen to anyone
regardless of whether or not they've actually taken acid
(expression "seeing stars" sound familiar?)
so, just because your friend had whatever sensations
undergoing this medical procedure doesn't mean that it
re-activated acid stored in his system, a claim for which
there simply is no medical basis, and sorry if i think that
research happens to be more reliable than anecdotes,
but i like to think that's one of the more useful viewpoints
we've picked up since the middle ages
also the rest of your story is a little sketchy, since from
what i know about spinal taps they're used mainly to
test you for something, i'm not sure why they
would be used for a slipped disk. of course, this is only a
minor point
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