Q 10

This question is in regards to the item "giggle gas", the description:
Spoiler: spoiler
Area burst 1 within 10 (creatures in the burst).
Attack: Item's level + 3 vs. Fortitude.
Hit: The target is dazed and slowed until the start of its next turn.

It seems like this is totally ineffective, as the effect fades when the enemy has a turn. What am I missing here?