Hmm... it's simplicity is beautiful. It's quite extraordinary how something so ...short... could hold so much meaning. There is something about this piece that just says 'look deeper'. I adore it. In a way I can feel the hatred, but, perhaps because the driving force of hatred is passion, it seems so sincere, so dream-like. It's wonderful, really.
However, the first two lines start with it's and then the third--although it follows the same pattern as the other two for the rest of it-- doesn't. Would it be better if it went like this:
It's just a little bit of something that burns-
It's just a little black smoke in your eyes
It's just a tiny little piece of my hatred for you-
I'm personally not sure which sounds better, but that is probably what I would have done--although that has no bearing on what is better or worse. And it wouldn't be a big change anyway. Of course, the littlest changes can make the biggest impacts. Who knows? I guess it really depends on you--the author.