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Smoke for exhausts is almost always cotton wool (use very little) and teased into shape. Good for display, but terrible for gaming - it's extremely fragile.
Flying debris (I assume you mean for the debris to be supported by the 'smoke') is usually sponge pieces (clump foliage, home made or otherwise) over a wire core, spray painted. This is actually more robust (especially if you can get away with shorter / thicker wire cores) and more suitable for gaming, provided you can transport the complete model easily enough. This does look very very dense - it's not 'wispy' like the cotton wool method, so if you're trying to have it look soft or steamy, rather than thick smoke, this really doesn't work so well. Does lend itself well to flying big chunks, missile or jump pack contrails, flamer spurts, etc.
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