Really interesting macro. I'd be curious to know how you did this. Did you light the cigarette and just let it burn? That's a lucky position if you did.
Good details on this macro. The texture of the ash is very good. Compositionaly, I would have preferred that the edge of the cigarette butt weren't cropped out of the photo. For me, the angle of the ash leads my eye up to the left side but because the subject has been cropped, it allows my eye to leave the photo off the edge. JMO.