I'm still working on snuffing technique, but sometimes I just want a 'hit' without worrying about getting it in my sinuses or down my throat. Attached is a pic of something I tried today which seems quite useful.
It's one of those flexible drinking straws (trimmed) with a bit of flexible tube attached. I put a dose of snuff in the bent end of the straw, aim it up my nostril and then, with the tube in my mouth, blow it in. It only needs a very gentle blow - eg. like if you were spitting a seed out.
This seems to be pretty effective at delivering the snuff exactly where it needs to go, but no further. I wouldn't recommend using it outside the privacy of your own bathroom though... ;-)