I edited this page by adding more information only to have someone else come back and erase everything. I tried to add a comment to the page but it does not seem to be working on my phone. So for anyone that wants it this is what I trued to add.
If you give correct answers to everyone that speaks to you after spiking the wine you will not be caught. One person asks you if you think Persephone should expand her palace West or East. You should answer West. Another will ask you who you think Persephone's soulmate is. Hermes or Adonis. The correct answer is Hermes. Finally a woman will ask you about a rumour that Hekate is plotting against Persephone. Answering that Hekate and Persephone are friends gets the best result. Once all wine vats are poisoned you will go back to the first person you smoke with who will compliment you on your conversation skills if you answered correctly. He will then propose a toast. If you found the double agent and warned him he will put down his glass and walk away. You then have two options: Drink up or Don't Drink The Wine! If you choose Drink Up people will start dying immediately. You will then make a comment about Hekate telling you it was slow acting. Guards will have heard the screams and confront you. Fight or Run once all guards are defeated or you escape the quest will end.