Okay this is a common misnomer that has lived through the ages about Beatles, let it be known not all Beatles songs are drug related.

Lucy in the Sky with Diamonds was not about LSD, even though the acronym fits.

I have it on a die hard beatle fan who has researched these things that LSD was actually written by John Lennon when Julian showed him a picture he drew which had a picture of a girl (Lucy) in a Sky full of Diamonds.