no. % damage to demons does not apply to smite or kicking.
The Great Mother
Smite Damage
Modifiers that do NOT apply to Smite
Weapon's base damage
+% Enhanced Damage on the weapon
+ to Minimum/Maximum Damage *)
+% Damage to Demons/Undead
% Critical/Deadly Strike
% Life/Mana Stolen per Hit
Magic, Fire, Lightning, Cold, and Poison Damage
Cold and poison length
Ref: Basin Wiki, Paladin Combat Skills,
http://wiki.theamazonbasin.com/index.php/Paladin_Combat_Skills#Smite
*) including Adds Y-Z Damage (read: +Y to Minimum Damage, +Z to Maximum Damage) whether on the weapon or off-weapon (War Traveler).
How is Smite Damage calculated ?
Take the shield's Smite Damage
Add bonus Smite Damage from Holy Shield (HS)
Add X from Damage +X (Grief, Astreon's Iron Ward, The Redeemer, Stone Crusher)
Add the sum of Enhanced Damage bonuses from the following sources
+% ED from Strength (in a 1:1 ratio, regardless of weapon used)
+% ED from skills (Smite, Might, Concentration, Fanaticism)
+% ED which is off-weapon (e.g. Fortitude)
Smite Damage Formula
Physical Damage = [ ( {Shield_min + HS_min , Shield_max + HS_max} + X ) * ( 1 + Strength/100 + (skill +% ED)/100 + (off-weapon +% ED)/100 ) ]