The pigs' discovery of whiskey has a long term result, much like it has on people. At first when the pigs discover the whiskey, they consume it and many things are heard from the farmhouse. Napoleon is declared almost dead in the morning, but by the afternoon that next day things seem to be feeling much better for him. In the long term, this finding helped alter yet another commandment of animalism and it drove the pigs to an addiction. In my opinion, part of what caused Napoleon to need to go to great lengths to gain money was his desire to consume alcohol. This meant the animals worked harder and had to risk some of their own.