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Why does smoke go faster up a taller chimney?

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sebwiers:
Two reasons I can think of

1- The warm air accelerates as it rises ; taller chimney means faster moving air at the top, which means lower pressure at the bottom.  When you look at it this way, the question is much like "why does a taller waterfall have faster moving water at the bottom".  Um, because.... that's how gravity works?

2 - Having the top of the chimney higher up usually means its exposed to faster, less turbulent wind, which again, creates low pressure and draws air up from the bottom.

R.G.Y.:
Another point for consideration, chimney with bends in it will raw better than a straight one ?????

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