I wouldn't ask this if the DoT didn't use the same graphic effect of Teemo/Singed/Cassio's poison, but since it does, I'm left to wonder. It would be nice if they had this sinergy since I love both of them (Cassio and GP). Then again, I guess GP's rework might alter his passive so it's just a guess for guessing.
The MageLord15 votesBecause the Grog isn't poison, it's alco- oh. Never mind.
Neo Cyrus6 votesIt's old code combined with laziness. Don't worry, they're effectively deleting Cassiopeia next patch. And so my champ pool becomes smaller by the day.
Saianna2 votesI have no idea why someone would downvote you...
Titanium701 votesIt´s poison! xD No for real - everything listed as "poison" in this Game works with Cassio, things like: Teemo - E,R Singed - Q GP - Passive Twitch? - not sure, but i guess it should work And even GROMP! (DId i miss one?)
SgtCrispy1 votesGP's passive does not work with Cassio's E. Why? No clue, pretty sure it's just an oversight. It works with everything else you listed though.
Kommandant Kled1 votesIm like 90% sure it doesnt work with Twitch poison, since the poison is different then the others.
Darth Valer1 votesGP's poison doesn't work with Cassio. You can read it on the Wikia too.
warpenguin5551 voteswait it doesnt? i thought it did
brad1 votesbecause it didnt used to have the poison effect icon thing, it just used to do damage