drugs & GR

[Eric Dean Rasmussen]

Has anyone written about Pynchon's use/treatment of drugs in GR?  I'm in 
the process of writing a term paper on the subject & haven't come across 
anything.  I'm not so much interested in biographical material (such as 
Andrew Gordon's "Smoking Dope w/ TP") as criticism that discusses the way 
the numerous drugs allusions & references (particularly LSD) in GR "work" 
within the text itself.  

Any comments, remarks, pointers, etc. would be greatly appreciated.

THanks, eric