I don't know, Michel. Time and again, Flocke tells us that he lost his humanity. We saw, in "Across the Sea", how he lost it. Becoming smokey is the 'worse than death' fate, that befell MiB. It was Jacob's mistake.

Flocke also told us that he likes to walk because it reminds him that he was once human. I don't think smokey escaped from the light, I think his soul is trapped within the smoke. I think that it is MiB trapped in the smoke essence, and ever since his real ghost mother told him that he came from across the sea, he's wanted to flea. He wanted to go for 30 years when he was alive and human, yet special.

What I don't get is that clearly he knows that he can get off the island via the wheel under the Orchid. He took Locke there, when he appeared as Christian. But, he couldn't go, as his Fake mom told him he could never go. So, is this a loop hole or not? Apparently he cannot leave via the wheel. We all know now that if he gets off the Island, life as they know it will end, and everyone they love will die. Will everyone that they love die, because the light on the Island will go out, and therefore go out in everyone on earth, all men. At least that's the way I am starting to see it....