Artangs are evil humanoid creatures from the Star Heritage adventure game, which I am still translating (if you remember). I am now close to the end BTW...
You use the adjective forms with smell and other verbs of the senses when they are used as linking verbs. Here you have a direct object smell your stash, so it's not a linking verb, and the adverb form is needed.
Compare: The wine tastes good. (not well) The judges tasted the wine carefully. (not careful)