"Mary Jane" is a song by American musician Rick James.
The song peaked in the top five on the R&B charts in the United States in 1978,[1] and crossed over to the US Hot 100.
As one of his earliest hits as a solo artist, it is one of his most notable songs.
It was composed by James, along with keyboardist Billy Nunn, who was credited for the keyboards, strings, background vocals, helping to compose the song, arranging flute parts, and other instrumentation work.
The lyrics of the song are a thinly-veiled ode to James' love of marijuana aka "Mary Jane".