I wonder how often the more serious crime wouldn't have been charged had the drugs not let to it? For example, carrying a firearm isn't necessarily illegal, but carrying a firearm and weed in a place where weed is illegal is most likely a separate, non-drug charge like "carrying a firearm during the commission of a crime". Also how many non-drug arrests would have never happened if the officer hadn't been able to manufacture reasonable suspicion by simply saying, "I smell weed".