I don't know if the torment of the damned continues forever, or if 'eternal' simply means the damnation of the lost is irreversible. There are good scriptures on both sides of the argument. Perhaps more on the side of the eventual obliteration of the damned. But still, a horrible conscious torment of the damned before that, nevertheless.
It does no good to argue that the conscious suffering of hell is for a time, or for an eternity. The point is Jesus said there is the punishment of the damned, and it is real, and it is ugly. You don't want that T-shirt. That's really all people need to know.