system
Given the following post, respond as if you're commenting on Reddit:
human
[Lost] What would have happened if the Smoke Monster got off the Island?

What did the Smoke Monster plan to do after it got off the Island?
gpt
Depends on what you think it really is.  The show is purposefully vague about this.

If you believe it's just Jacob's Brother who has acquired bizarre smoke powers from being murdered and tossed into the heart of the Island, he'll probably do exactly what he says he'll do.  Leave the Island, explore the world, be free.  He might randomly murder some people because he's a bit of a dick and no-one can stop him, but it won't be the end of the world.

If you believe it is, as Jacob explains, a primal force of evil that is being bottled up by the Island, then its release will be an apocalypse of biblical proportions.  It will use its powers to read minds, influence dreams, and shapeshift into people in order to sow chaos and disorder among the peoples of the world.  The end result will most likely be Nuclear War, and the extinction of the human race.

If he lives up to his namesake, he'll probably get back in touch with the Crimson King, and begin again the great work of breaking the beams.