You're browsing the GameFAQs Message Boards as a guest. Sign Up for free (or Log In if you already have an account) to be able to post messages, change how messages are displayed, and view media in posts.
Unless they stopped capping poison at 255 damage, yes it does. 255 damage is nothing in the later stratums. For Alchemists, you can make much better use of those skill points than a measly 255 damage per turn.