It should be real easy to manipulate the shape of smoke. We have 3 different "smokes" to work with: black_smoke#1, #2, and #3.
In essence, make one thin, but highly dense column that rises very slowly. This should be the base of the smoke.
The second column should be a little wider, less dense, and rises faster than the first column. This should be the middle section of the smoke.
The third column is the widest in diameter, the least dense, and rises the fastest. It will get to the top and be very wide, creating the mushroom effect.
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