The Gods of Eden by William Bramely :
Fantastic book about how aliens own the human race and how they indirectly control almost all warfare because they are actually what we worship as "god"...sounds pretty wacky but its actually a fantastic book, i've read A LOT of books in my time and reccomend this book over any others...really interesting/mind boggeling/hard to put down. It's nonfiction btw too
The Once and Future King: T.H White:
CLASSIC, best book out there that's about king Arthur/Lancelot/knights of the round table and all them foolios... White is a great writer, very witty and imaginative, he includes a lot of his own beliefs about god and the universe, really long but it doesn't get boring, there aren't really any dry spots. It's 1000 pages of pure entertainment!
Flowers for Algernon by some guy who's name i forget

About this mentally retarded guy who becomes the first person to ever recieve intelligence enhancing medical treatment, written in journal format, this book is impossible to put down...so.. so.. good...
Hamlet by William Shakespeare:
Just jokes! what a fag though eh?!? who read that shit on their own time???
Goblin Quest by Jim Hines:
K this would probably be considered more of a children's book, but its so funny and great to read whilst fried... A MUST READ FOR EVERY STONER
None of the books i mentioned contain and drug reference except for Gods of Eden which briefly explains the rituals of the hash-hish assassins who pwnd to no end...that is all...