Does Celestial Poisons work with Poison Bombs? It says "poisons the alchemist administers to a weapon" but from Bomb class feature, "bombs are considered a weapon". If you're changing the bomb damage type to a poison effect (which Cloudkill is), it seems to me that you'd pretty clearly be adding poison to a weapon.
I don't know the answer to this either. It seems like a logical leap, since poison bombs are something the alchemist creates (it's a subset of their 'alchemy' class skill). It'd be very useful if that's the case.