Not that I'd want to snort codeine, it works just fine for me taking it orally. However, the argument against snorting that I've seen reading threads on this website is that snorting codeine doesn't work because codeine itself is a weak opiate, it needs to be metabolised in the liver into morphine. However, according to this Erowid page, the liver metabolises virtually all drugs, including the well known snortables cocaine and methamphetamine.
My question: Why doesn't snorting codeine work (going by what people here have said) when snorting meth and coke does work? If those two are both metabolised by the liver, won't snorted codeine be as well, allowing it to be snorted with effect?