Black Sabbath
Sweat Leaf
This was the song that coined the phrase "sweet leaf" as slang for marijuana. They got the name from a pack of Irish Cigarettes that said "It's the sweet leaf." They thought "sweet leaf" was a great description of marijuana, and the entire band wrote the song together.
Guitarist Tony Iommi can be heard on the track coughing after Ozzy Osbourne passed him a joint.