No, Jack did not become the Smoke Monster; he became the new Guardian of the Island's light, replacing Jacob, while Hurley became the new protector, but the Man in Black (MIB) was destroyed, preventing a new smoke monster from forming from him, though theories persisted about Jack taking his place as a new entity after his sacrificial death. Jack's role was to be the "cork in the bottle," sealing the light, and he was conscious as he died, unlike the MIB, who was forced into the light while unconscious and transformed into the monster.
Jack didn't die while he was in the source, so he probably didn't become a smoke monster. Keep in mind, when the MIB became the smoke monster, the source spit out his dead body.
MiB's body fell directly into the hole where Jacob would later have the cork built. To stop it happening again. That's why the black smoke was created almost as soon as his body went into the cave. There was no cork system yet to prevent a whole person going down there.
Weird this didn't get more upvotes because it's the correct answer. MiB can't kill Eko initially due to candidate status. Fear has nothing to do with it, smokey is attempting to manipulate things to get himself off the island. Killing every non-candidate immediately wouldn't really help that.
4 Sun-Hwa Kwon
Of the three casualties on the submarine, there's an argument to be made that her death was the saddest, since she was debatably the kindest (or least flawed) of the three. She deserved better, basically, than to be caught in place while the room around her flooded in.
The Island only heals good people. This explains why Ben was not healed of his spinal tumor but Locke and Rose were healed of their ailments, and why some people fall ill to the Sickness while others stay perfectly healthy.
The Man in Black (also called "The Smoke Monster" or simply "The Monster") is the main antagonist of the American ABC television series Lost. He appeared as a cloud of black smoke until the final episode of season five where he appeared as a middle-aged man dressed in black.
This was confirmed to be the Smoke Monster in disguise by Damon Lindelof in the Official Lost Podcast. Outside of the Smoke Monster form, though, the other way the Man in Black presents himself is in the forms of deceased people - most notably Jack's father, Christian, and in later seasons, John Locke.
He believed his special destiny was to protect the miraculous place. In service to this cause, Locke became a "Man of Faith", sparking an increasingly tense rivalry with Jack who was in contrast a "Man of Science".
Aside from making sure the Man in Black stays on the Island, Jacob brings people to the Island to further a philosophical debate that humanity is innately good while the Man in Black echoed their mother's belief that humanity is inherently corrupt, a debate that has raged on for centuries with numerous casualties.
Ability. Walt is "special" because he can manifest his thoughts into reality. In the episode "Special" (Season 1) while playing backgammon with Hurley, Walt thinks a number out loud and then rolls it.
David is not Jack's son
Jack's biggest issue was with his father, but his father died before things could be resolved. Since Jack himself never got a chance to be a father in real life, David pretended to be his son in the flash sideways, and thereby let Jack understand his own father.
Ben killed Locke because Locke needed to die in order to be reborn, but could not die by his own hand. Locke needed to accept his fate, but not hasten it (i.e. by suicide). Ben has a role to play just like everyone else; he's been privy to this role for longer, though, and thus is much more resigned to it.
As a werewolf, Jack can detect magic and use this ability to track anyone who is performing dark magic. Being a werewolf also strengthens his magic allowing him to perform stronger spells. Jack lost the spirit of Silverback and is now bonded to the spirit of Midnight.
Ben is the pawn of Smokey/Jacob's nemesis. He was manipulated into becoming the leader of the Others, but was not Jacob's choice (visions of his mother indicating he was to join the others). He needed to be ready to kill Jacob when the time came.
Because the writers clearly hadn't planned the story far enough to know what his backstory was going to be. Ethan's purpose was simply to be the creepy Other with supernatural strength and leave us wondering who-the-F-are-these-people.
Kate was revealed to have been crossed off due to becoming a mother.
John Locke was a believer. He was a man of faith. He was a much better man than I will ever be. And I'm very sorry I murdered him.”
The Island can heal normally untreatable conditions, such as spinal damage (Locke), cancer (Rose), and infertility (Jin). Injuries heal much faster than they normally would, though by no means are people incapable of dying.
Sun didn't go back in time because she was not a candidate. There is strong evidence that Jacob and his brother are based of the story of Jacob and Esau from the Old Testament.
Through the Looking Glass: Part 1
Jack and the survivors wait for Charlie to turn off The Others' signal-jamming device, not knowing that he has been captured at the Looking Glass station. Without a doubt the best episode! The most shocking ending of an episode. The chance for escaping the island.
According to an article from Forbes, Matthew Fox was the highest paid actor on Lost. By the end of the series Fox was getting $250,000 per episode to play series lead Jack Shephard.
"Lost" costars Dominic Monaghan and Evangeline Lilly broke up in 2007 after three years of dating. In an Aug. 31 interview with Anna Faris on her podcast "Unqualified," Monaghan, 45, revealed that the split was his biggest heartbreak. "I think I've only really got my heart broken once in my life," he said.