laughs and smiles, contrasted

C.   "....Strange, that laughter, man's lowest attribute, is distinctive; while the smile, which seems borrowed from Heaven, and which can confer rapturous joy, if not happiness, is shared, I think, in a slight degree by brutes." 
(Scenes Beyond the Western Border, Southern Literary Messenger, June 1852); and
Scenes and Adventures in the Army

"True, it is said that a man may smile, and smile, and smile, and be a villain; but it is not said that a man may laugh, and laugh, and laugh, and be one, is it, Charlie?"

"Ha, ha, ha!—no no, no no."  (The Confidence-Man)