I almost made the mistake of reading comments before critiquing, but stopped myself three or four posts down. I like this piece a lot.

Because I like it a lot, I'm pulling out the chainsaw and straight razors:
The tone of terms like "heart stone cold" and "hold his soul" seems too different from "he just ain't right" and "junkies for a light." Although I think the "outsiders must hold his soul" line is a little weak, I think the tone of that is better suited to the rest of the poem than the tone of the stanza after it. I do think you need to make a direct drug reference, like you do with junkies, because this part is the key that makes the theme clear. But, maybe you should play with a few different wordings to see what might fit with the overall tone more smoothly.
"spleen," as real an organ as it is, has been used in comedy so much that it's hard to read the word without thinking it funny. Maybe it's because that's where the fart-fairies work their magic.
I think you should work with this. Two general suggestions, first is pacing and development. A poem like this, telling a narrative, might benefit from a bit of narrative structure. By this I mean to develop the problem slowly from one stanza to the next. For example, after your introductory stanza you could have him hanging out with the "cool kids." Then, have him curious or exposed, then enraptured and blissful, then obsessed, then fallen. Maybe even dead at the end.
My second suggestion is on form. I like that (a recent topic somewhere else here) you've written free-verse while at the same time inventing your own conventions. This is the style as I've pinpointed it.
seven 3 line stanzas, one 5 line stanza.
Basic rhythm pattern (+stressed, -unstressed):
+-+
-+-+
-+-+-+-+
Since you've created your own rhythm pattern (something I personally feel is necessary in my own poetry), and an interesting one, I think you should develop it and try to play with your stanzas to follow it more closely. It's hard to follow exactly, but I half-cheat when I do it. If this were the rhythm of one of my poems it would probably be schemed like this:
-+
-+-+
-+-+-+-+
Any unstressed syllable might be removed, replaced with a comma, or have another unstressed syllable with it, but I would try to limit this mostly to the starts and ends of lines, and probably not want to do it any more than once or twice per line. That's when the rhythm would start to become noticeably clunky.
As for the final stanza. I've always been fond of bookend stanzas, ending with the same as the beginning, but I've always been steered away from it. That's all I've got to say about the final stanza being the same, but on its rhythm: I think you should try to either reverse the pattern of the regular stanza-rhythm, so that the poem (his life in addiction) dwindles to nothing at the end. Or, maybe give it a uniform rhythm, so that each line is the same and the poem ends of in a regular cadence.
edit: I didn't even notice the internal rhymes. I like rhyme, and think that it is way undervalued in general. But I also like not-rhyme. I think it's good to write in rhyme, but you will be a much stronger poet if you dabble in both - your skill set will be expanded and crossover one to the other. In the case of this poem specifically, I think rhythm should be a much higher priority. Some of the rhymes work nicely, but I don't think you should sacrifice rhythm or meaning for rhyme.
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