This is probably simpler than you’re thinking. It’s literally just “there’s more smoke”.
Camp fire smoke doesn’t “go away”, it just gets thinner / less dense as it spreads over a larger area. There’s a certain thickness of smoke you can smell, and a certain thickness you can see. Any thinner than that, and you can’t see or smell it. So when you get far enough away from a camp fire, the smoke is thin enough that you can’t detect it and conclude that it has “gone away” / dissipated / etc. All that means is “spread too thin to see or smell”.
Well, wild fires make a lot more smoke. So much smoke that even when you spread it over hundreds of miles, it’s still dense enough to see, and sometimes even smell. That’s all there is to it – **it IS dissipating, exactly like smoke from other sources does. There’s just so much of it that the dissipated-enough-that-you-don’t-see-it point is hundreds of miles away rather than the 20 foot plume from a campfire.**
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