NilsC and I, as well as many others, troll tubes from the yaks just about every time we go out and they really produce!
Last weekend I was paddlin' around Quonny and the wind really kicked up. I didn't have any worms with me as I wanted to throw wood but the wind just got to be too much.
So, I threw the trusty BubbleGum tube off the back and got 2 on the way back to the launch! 2 fish on a tube with no worm!!!

I picked up a pkg of scented rubba' sand worms on the way home just in case I get stuck in that situation again but the bottom line is... TnW works!
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EDIT:
And I might add, after reading Mr. Sandman's post, we typically use 1/2 worm (makes em' last longer and you don't need a whole one) and have caught MANY fish on a stub.
I believe, as previously said, the tube is what attracts the fish, the worm just helps seal the deal. But, I don't care if you have a fat, 6" worm on the end, if you go too fast you won't get the hits - unless you are after blues.
When I say "too fast" I mean anything faster than the current. There are times we have to dip our paddles in the water to slow us down if the wind is too strong. But, I have also had blues nail the tube when I'm crankin' it in to check for weeds.
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Tight Lines,
Rob