Denver could be the Emerald City, The Yellow Brick Road could be Nebraska, and Munchkinland could be Iowa... It could work, the wicked witch could be some dumbass cop trying to catch them, and the scarecrow could be someone who gets insightful when stoned but is a dumbass normally, the tinman could be a cold prick until he gets high and loves everyone in sight, and the cowardly lion could become brave with a little something to calm the anxiety...