There are a few other breeds to consider that also have 5 toes: Faverolles, Dorkings, Houdans and Sultans.
Correct me if I'm wrong, but it looks like Smokie has 5 toes, small amount of feathering on the shanks, slate/white legs/skin, straight comb, no beard no muffs.
Other characteristics to consider of these other breeds:
Silkie: black skin, sometimes beard, crest, pea comb, silkie feathers (recessive), feathered shanks
Faverolles:Feathered shanks, white skin,beard and muffs,straight comb
Dorking: white skin, straight comb
Houdan: Crested, beard, clean legs, white skin, dark shanks, V-comb
Sultan: Crested, beard and muffs, feathered shanks, white skin, V-comb
Based on the mix, I am not seeing crest or beard, no black skin, no hybrid comb. I could be wrong, look closely at the comb and feathers about the head and correct me if you see something different. I am seeing slight feathering on the shanks and a straight comb.
Based on these parameters, I am thinking a Dorking crossed with something feather-footed with a straight comb. Could be some lines of Marans, Cochins or Langshans. Langshans have slate legs and relativiely sparse leg feathering so I am going with that one as a guess: Dorking x Langshan.
If you want to learn more about breeds then I recommend to consult Hederson's breed chart:
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html
and Feathersite.com
http://www.feathersite.com/Poultry/CGK/Langshan/BRKLangshan.html and
http://www.feathersite.com/Poultry/CGD/Dorks/BRKDorks.html