Subject: Why do effects from LSD intensify when popping/cracking the neck or spine?

D-lysergic acid diethylamide has a legend(?) concerning strychnine being 
present in doses.  Further research shows that in less than .5% of doses 
tested strychnine was present.  Anyway does strychnine or LSD build up or 
are either affected by spinal cord movement? I know that strychnine is 
neither used in the synthesis, produced by the synthesis, or a possible 
contaminant of the synthesis. But just look at the structures of           
strychnine vs Lysergic acid/LSD/etc and you should be able to understand 
that readily.  What causes back cracking/popping to intensify a trip or 
bring about a flashback.

Re: Why do effects from LSD intensify when popping/cracking the neck or spine?