I can give a basic answer but I'm not 100% on the pharmacology so will gladly be corrected by anybody with better knowledge
Basically; in theory, yes it does work. In practice, it's just not worth it.
If snorted/insufflated it will get absorbed into your blood via the mucus membranes and circulated around to your liver where it has to be metabolized into morphine, at a ratio of about 10%. So a 30mg codeine tablet would be metabolized into approx 3mg morphine.
But the real issue boils down to tolerance really. I don't know about you, nor anyone else, but I get my codeine tabs in 28x30mg so generally halve that into 2 doses of 14x30mg=420mg codeine/10=42mg of morphine.
At most I think you'd probably be able to insufflate, say 2x30mg tabs in each nostril? So you'd only be able take 4 tablets, in which case I think your nasal membranes will be completely saturated with powder and you'll get a nasty drip down the back of your throat for a long time. For the sake of just 4 tablets, of which I'd expect about 20% to be wasted during the insufflation process. I dread to think anyone has ever tried insufflating 14x30mg tablets... though I bet they have, there are some silly people in this world of ours.
Codeine has a 90% oral bioavailability and since it is a morphine pro drug, it has to be metabolized in the liver first anyway. Since there's probably a negligible time difference it takes to get to your liver via your mucus membranes as opposed to just swallowing it, and the dose that you'd have to insufflate would have to be huge, you're far better off just swallowing them and maybe using a potentiator to make it more potent if you wish. If it was a drug that could be taken in a very small dose straight into your bloodstream that doesn't need metabolizing by the liver, then yeah insufflation is a viable option. But codeine just isn't. And that doesn't mean you can snort Oramorph either 8(
But please seek harm reduction advice before ever using a potentiator. I was planning to use Benadryl as a potentiator and just before I left to go to the chemist I saw that when taken in recreational doses in conjunction with MAOIs/SSRI's it can cause Serotonin Syndrome, which can be lethal. I take a heavy dose (425mg) of Venlafaxine so have steered well away. I shouldn't have been so stupid to not research it properly. Learn from my mistake.
So that should give you a basic answer for codeine, I honestly have no idea about other opium drugs. Here in the UK it's pretty much Codeine/DHC or Oramorph, the US seem to use different products such as hydrocodone, oxycodone which are more potent so you'll have to consume less so insufflation *may* be done by some people. Although again, if they're a pro-drug then they've got to be metabolized in the liver so I doubt it's worth it. If someone can let me know about this I'd be quite interested actually. I've only used Codeine/DHC and Oramorph so have literally zero knowledge on other products.
I hope this helps and as said, I will happily stand corrected if I've erred in my advice.
Play safe,
Rybee
