Came back to show you I could fly

Ah yes, school English texts. In hindsight, when I look over them all together, they really weren't all that bad. But some were a bit irrelevant to me, at least at the time, like this one. I don't remember the storyline, but the main characters are some naive young kid who befriends some teenage or early-20's drug addict. Adventure ensues, I presume. I could probably relate to it a bit now, although I don't remember what the morale of the tale was.