"A song like 'Got to Get You Into My Life,' that's directly about pot, although everyone missed it at the time," McCartney said.
"'Day Tripper,' that's one about acid (LSD). 'Lucy in the Sky,' that's pretty obvious. There's others that make subtle hints about drugs, but, you know, it's easy to overestimate the influence of drugs on the Beatles' music."
John Lennon, who wrote "Lucy in the Sky with Diamonds," had denied the song was about drugs and said it was inspired by a nursery school drawing by his son, Julian.
"Just about everyone was doing drugs in one form or another and we were no different, but the writing was too important for us to mess it up by getting off our heads all the time," McCartney added.