To blend skin tones and glow and smudge tool more smoothly giving it a more realistic look
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Illustrator is a vector-based drawing application. Smudging is something usually applied to pixel-based graphics. That’s why Photoshop does have a Smudge tool, and Illustrator doesn’t.
It offers Feather and Gaussian blur as an raster-based effect, but that’s it.
Perhaps you’d be interested in this somewhat similar request?
Different Customizable Shape Gradient Constraints: http://illustrator.uservoice.com/forums/333657/suggestions/42682097