There's an increased "high feeling" for around 30-45 minutes when a substance is insufflated not ALWAYS, but mostly). The bioavailability can increase (I believe this is the case with Dilaudid/hydromorphone - oral tablet BA=like 25-30%, but insufflated it can be close to 50%). The studies are sketchy in this area, but there's at least a lot of gathered experience here on the boards.
They make Butorphanol, a Sched. IV Opiate Nasal Spray (similar partial agonist/antagonist model, just weaker, than Bupreorphine), which just increases the quickness of delivery method (taken orally, it works just like other opiod analgesics in its class). I used to make my own Dilaudid nasal spray by crushing (mortar and pestle, filtering (microfilter - not JUST cotton), putting it in saline solution (just like < 0.10 amount, even that's high). Then I put over a candle or heating source (careful the bottle gets HOT), then every couple minutes shake the solution to get the binders/fillers out.
After all the crap is filtered out, they're just like (sorta lol) pharmaceutical grade (remember NO IVing these! Follow smarter BLers than me if you do that).
If you add Saline to the dry, crushed pill solution (and remove binders/fillers, which often are toxic to the body - lungs and heart), you're just snorting drug + saline solution (- binders and fillers), which is always a good thing. I swear to god I am allergic to some medications just because I've only ever tried one brand, and the binders and fillers are the issue. Oh well.