Yeah, I admit that meth COULD be in that list, but having read almost everything Hunter S. Thompson wrote, I don't see him as someone who would do meth. Speed, yes, but not meth specifically. The fact that meth only began to be made for recreational use in the late 60's also leads me to believe that it simply wouldn't have had the time to permeate the drug culture to reach a point where it would have been written about in a major work.