I think that the black pillars of smoke and the "security system" are different because the pillars of smoke were coming from something burning in a fire where as the "security system" smoke was just kinda hovering and moving on its own. Just a thought

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\"We\'re not alone on this Island and we all KNOW IT\" - John Locke

Locke: Why do you find it so hard to believe?
Jack: Why do you find it so easy?
Locke: It\'s never been easy.