My re-watch has taken me through season 2's "The Hunting Party" and I've noticed that Jack and Locke never seem to cut their hair, and it also doesn't appear to grow. I don't remember if this ever gets addressed in later episodes or not, but we see Michael and Jin's hair grow quite a bit and we also see Kate give Sawyer a haircut while Jack and Locke never seem to need one.

So their is either a trivial explanation for this that involves off screen grooming, or could it have something to do with Locke's season one smokie encounter and something special about Jack, maybe related to how he woke up in the Jungle? Maybe I'm just nuts.

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