Would an Undying Light Warlock/Paladin add CHA bonus to damage from Divine Smite?

@ChewBobccaWould an Undying Light Warlock/Paladin add CHA bonus to damage from Divine Smite since it uses a spell slot? specifies spell – so no

— Mike Mearls (@mikemearls) February 7, 2016

@ChewBobccaThought so. So it would work with spells like Searing Smite or Branding Smite, but not the Divine Smite feature? correct

— Mike Mearls (@mikemearls) February 7, 2016