Sneeze in opponent's face: /blind
If someone is talking and you want to interrupt them....kick them.
What if the lubricative effect makes your attack (glancing), the risk isn't worth the extra dot poison damage at the risk of losing the bulk of physical damage of your main attack.
Added to which by the time the dot kicks in, the fight will mostly be over, since upfront damage from physical attacks will lower their stamina, which will eventually cause them to be stunned and you can finish the job easily, making any dot damage thereafter irrelevant.