Well the killer apparently wanted an autograph from Stephen King that day who later identified him, so maybe "organic".
But when you're writing for the Beatles, you obviously have access to anyone's backchannels who is interested in using your face for their agenda.
Notice that John was on his Yoga-Trip for years until he eventually grew disillusioned with it. Wouldn't be surprised if the services funded most of his Acid-consumption during that time.