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(dnd 5e) Prove me wrong, RAW
(sh.itjust.works)
Disclaimer: this is purposefully obtuse.
Other effects in the game which explicitly state they kill you:
Shadows, succubi, massive damage, death saving throws, beholder death ray (notably not even their disintegration ray kills you), power word kill, vampires, mind flayers, night hags, drow inquisitors.
Clearly, if they intended for disintegration to kill you, they'd have said so. Since specific overrides general, and there is no general rule that disintegrated creatures are dead, I rest my case. QED.
I've never played DND so I don't know if this is something you could pull off or anything but I'd probably be like
"I snort the fine pile of dust" and then, I don't know, there's some latent personality or intention there, so now we have to alternate playing my character between turns/minutes or something. It'd probably make for some great RP moments, especially if each personality couldn't remember very well what the other was doing previously. Maybe the class and abilities change with each person, which makes arming up appropriately interesting or a pain depending on how we handle it I suppose.
That would definitely fit right in at our table. Half the group is trying to break the game with their build, and the other half is trying to one-up the first half.
I'd say ingesting the powder either kills it (had the players managed to get me to agree it was alive) or sends it on a tour of your digestive tract