Started as an afternoon doodle to try out the new refractive material and it turned out to be pretty realistic. Now I want see if I can build a small scene around it. 
You could make the smoke shape you want and then duplicate it so many times. Each duplication you scale up using the inflate brush with a large brush size and a small intensity and adjust the material to blending and adjust the slider. This can kind of fake a faded edge with volume. 
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Oh interesting! Thanks Adam!
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