Whats your definition of Smooth?

[ONE SHOT]

Width and thickness of the limb laminations from one Bow's limb design to another Bows limb design is the determining factors for how smooth a Bow draws at any poundage or draw length for that matter.

A Bow's limb that is twice as thick is 8 times stronger, be it a one piece solid wood limbs or various F/G backed wood laminations.
Another way to look at the  question is take a tree that is 1 inch in diamenter and one that is 2 inches in diamenter and try bending each tree, the 2:1 ratio still applies in both cases, just a simple fact of physics, same holds true for Bow Limbs.

Without knowing for sure the thickness of all the components of the limb, you are mixing Apples and Oranges....ONE SHOT...          

[Tom Leemans]

I believe you arrive at smooth primarily with limb design on glass bows, but no matter what kind of bow, smooth is a result of expert tillering. When it pulls back to anchor with no "easy to hard" feeling (no noticable stack) and remains quiet in the hand at release, and is a pleasure to shoot, well that's a smooth bow.