Lucy In The Sky With Diamonds!Hallucinating drugs used in the 60's gave the Beatless a more creative outlook on their songs. For example, "We all live in a yellow submarine," what in the world were they taking to think of a song like that? Just saying, but the Beatles anyway.
Yes, there was a drug culture in Britain during their heyday and many songwriters (Donovan helped on the Yellow Submarine lyrics) dabbled. White Room by Cream, Itchycoo Park by The Small Faces are other examples.