I was reading up about Lewis Carroll, and I have to admit that I was wrong!!!
(Well, I was wrong once before, I guess that even hyper-intelligent pan dimensional beings, such as I, can be wrong sometimes )
Anyways, it seems that Mr Carroll (real name: Charles Lutwidge Dodgson) didn't take drugs...well, at least, there is no evidence that he did.
So, I apologise for saying that he did...I guess it's another case of 'urban-mythism'.