Look at these two words Cokaigne and Cocaine.
Cocaine as you know is a naturally occurring organic alkaloid present in the leaves of the coca plant. The drug makes one feel high, extremely elevates his/her mood and makes one feel suprime.
Cockaigne or Cockayne (from Wikipedia) is a " medieval trope denoting a mythical land of plenty, an imaginary place of extreme luxury and ease where physical comforts and pleasures are always immediately at hand and where the harshness of medieval peasant life does not exist."
The two words are oddly similar. I think back in time before cocaine prohibition, advertisement could be something like: Cocaine takes you high up into Cockaigne :D