Poison weapons

[Renojustin]

Says right there on the poison bow description, and I'm sure blowguns as well... anyone WOUNDED by the weapon will be struck by this effect.

EDIT: Just tried it, and it seems to me that you definitely don't need to take a wound to get affected by the effect. It's not beyond the realm of possibility that this might get looked at within the next few patches, but at the same time, there's good reasons to keep it as it is too.