Orbs of Smoke.

Each orb is about two inches in diameter. You throw it down and it
creates a ball of smoke thick enough to obscure one human body for 2d4
rounds. Spells that affect or create breezes can disappate the smoke in
1d3 rounds. Orbs are found either singly or a pouch containing four.
An alchemist can make one of these in about four hours.

How about that for a low powered magical item?

— Elton Robb