According to Bob Spitz, author of The Beatles: The Biography, it was Bob Dylan who first introduced the Fab Four to marijuana.
Bob Dyland and Tom Petty on the mic
Jack Nicholson, Keef and Bob Dyland, 1985
▶ Bob Dyland & The Band - "Orange Juice Blues (Blues For Breakfast)" [From LP 'The Basement' 1967]
MERLE HAGGARD - Natural High (+playlist)
Highway 61 Revisited: Bob Dyland's Road From Minnesota to the World – Minnesota Historical Society
BooksForKidsBlog: Words Make Meaning: Man Gave Names to All the Animals by Bob Dyland and Jim Arnovsky