These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
For those who can see it, there is also An Aesop about the futility of the Drug War.
It is also an Author Tract, since he dedicates it to Janis and other creative people lost to drugs.
It's worth mentioning that one of the people listed is himself (as "Phil"). He suffered pancreatic failure due to his drug use.
It also goes pretty far to point out the hypocrisy of rehab clinics and the system itself, also playing heavily on the idea that people who have been broken or tormented by drugs or mental illness are not only discarded but invalidated by their view on reality... in essence, no one would ever believe that the rehab clinic is in fact using drug burnouts to farm the drug itself. Philip Dick likes his irony.