Here's some more I just found...
John Prine, "Illegal Smile".
Steppenwolf, "Don't Step on the Grass, Sam"
Rush, "Passage to Bangkok"
Styx - "Light Up"
It's So Nice To Be Stoned, "White Witch"
Strike a Match and Light Another, "Cat Mother and the All Night News Boys"
Frosty the Dope Man, "Dr Demento collection"
http://www.angelfire.com/music2/pot/
'Yeke Yeke Hardfloor Remixâ??
linval thompson- i love marijauna
People Under The Stairs - Invisible Blunt Roller Part 2
arrested development - ease my mind
dead prez - sellin' DOPE

Also...of course how could we forget PUFF THE MAGIC DRAGON!