Reiterating this thread and my conclusions/beliefs...
-Do not snort CCC, this will cause you problems.
-You can snort DXM powder, but it is not even going to be as effective as just eating it.
-If you want to snort DXM, please make sure that you have either confidently extracted it yourself, or purchased pure powder. Both of these routes require that you are confident enough in either your own or somebody else's chemistry (albeit very basic chemistry) skills.
I recommend just getting some Robitussin or Vicks 44 with DXM as the only active ingredient, and chugging. Extractions are too much work to warrant the results, since the product is the same. I don't really find the taste that horrible though.
Good luck, please don't use triple C's.