Armoth said:that was a waste, can't you only metabolize like 400mgs at a time?
There is a lot of mis-information out there regarding Codeine, so I'm not sure what to believe any more. Apparently there is a ceiling effect at about 400-500mg, however anecdotal evidence suggests that many people are not affected by this ceiling.
Also, insufflation of Codeine causing death is a new one. I've never heard of that, but a massive histamine release in your lungs can't be good. However, I don't know whether that is even an issue, considering the amount that would make it there would be small. Surely taken nasally with an anti-histamine (fairly potent one [I keep meaning to try it with Polaramine, but forget, I want to see how it is as a potentiator]), then surely the risks of complications would be low.
The only downside is that it's not too effective compared to oral administration: the bioavailability of Codeine orally is so high its really not worth the bother.