I do not think that either Jacob or other man are or become smokie. I think that smokie is a seperate thing all together. Alot of people have metioned other guy using Locke's body. We know he didnt use Locke's body as it is on the big steel box. What I do think however is that everyone thought Locke was dead and therefore he used his persona to infiltrate the others so that he could get Ben to kill Jacob since he cannot. I also DO NOT think at all that this comes down in anyway as God vs Satan or any biblical people. I do not think the writer's would invoke the Bible or complete relegion into the show. Yes they reference it or we actually take things they say or do and refernce different books, stories and relegion. I do think that it is about destiny, faith vs science not good vs evil per say.
