Revealtion 14:9 And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,
10 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:
11 And the smoke of their torment 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.
The third angel now appears and in essence is trying to get people to make the right choice for God by letting them know what they will be facing if the choose Satan and his mark. If they chose Satan the will suffer the effects of fire an brimstone just like Sodom & Gomorrah. They will not ever have any rest day or night in contrast to the peace and joy Christians will have in heaven. It also talks of the smoke of the torment ,you you can not have smoke without fire, which the the eternal fire of hell which it says will be forever and ever, in other words eternity.