ya im not really a fan of songs about smoking weed...always thought that was kinda gay idk why. not really into the rap/hip hop shit while im high/ getting high. I would say that this is the best "stoner playlist" that ive created (the order is important):

Clint Eastwood- Gorillaz
Hard to Concentrate- Red Hot Chili Peppers
Knights of Cydonia- Muse
Comfortably Numb- Pink Floyd
Trance on Ecstacy- Nostrum
Saelglopur- Signur Ros
Dream Weaver- Gary Wright
Welcome to the Machine- Pink Floyd
No Quarter- Led Zeppelin
Mad World- Gary Jules
Sleeping Lessons- The Shins
Waiting For My Ruca- Sublime
Spiders- System of a Down
M.I.A.- Avenged Sevenfold
Skin Ticket- Slipknot

Yeah thats pretty much the sickest playlist while your high. The two songs i bolded are highly unknown but VERY VERY tripppy and cool. I also would like to suggest some albums/ artists that are awesome while youre high

Stadium Arcadium (Disc 2) Red Hot Chili Peppers
Dark side of the Moon- Pink Floyd
Fourth Dimensional Rocketships Going Up- The Gift of Gab (very talented alternative rapper, very highly reccommended)
Any Dave Matthews Band (the live stuff is better)
System of a Down's self titled album
Any Tool