What is the meaning of the ‘eternal torment’ referred to in Revelation?

Rev. 14:9-11; 20:10, KJ: “If any man worship the beast and his image, and receive his mark in his forehead, or in his hand, the same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb: and the smoke of their torment [Greek, basa·ni·smouʹ] ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name.”

What is the ‘torment’ to which these texts refer? It is noteworthy that at Revelation 11:10 (KJ) reference is made to ‘prophets that torment those dwelling on the earth.’ Such torment results from humiliating exposure by the messages that these prophets proclaim. At Revelation 14:9-11 (KJ) worshipers of the symbolic “beast and his image” are said to be “tormented with fire and brimstone.” This cannot refer to conscious torment after death because “the dead know not any thing.” (Eccl. 9:5, KJ) Then, what causes them to experience such torment while they are still alive? It is the proclamation by God’s servants that worshipers of the “beast and his image” will experience second death, which is represented by “the lake which burneth with fire and brimstone.” The smoke, associated with their fiery destruction, ascends forever because the destruction will be eternal and will never be forgotten.