For those interested in the more cultural angle of LSD use, I'd suggest the book, "The Electric Kool-Aid Acid Test" chronicling writer Tom Wolfe's (of the "Right Stuff" and "Bonfire of the Vanities" fame) time spent with Ken Kesey (of "One Flew Over the Cuckoo's Nest" fame) and his Merry Pranksters as they traversed the country in their day-glo, wound for sound, International Harvester Bus named FURTHER...norming out some freaks for sure. I haven't read it since 1994, but I'm sure it holds up.
The video above is supposedly from one of the "Acid Tests" sponsored, if you will, by Ken Kesey and the Merry Pranksters. Aside from the Grateful Dead, the dude about half way through the video with a huge cigarette (?) was Jack Kerouac's "On the Road" traveling companion and steadfast driver of "FURTHER," Neal Cassady...Stay tuned for the "On the Road" movie later this year (mgt. not sure how I feel about the movie, I smell failure...but since it stars k-stew, I know some people who are going to get behind it.)