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Smiling is an essential ingredient in Thich Nhat Hanh's practice. Starting when one wakes up, and prevalent in many of his talks, writings, and instructions.
So if he teaches today that which the Buddha taught, you can extrapolate backwards.
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If I may bring forth an answer to my own question, I have found a passage in the suttas that may provide some useful information on the matter. In the sutta MN 81 With Ghaṭikāra it is said :
So I have heard. At one time the Buddha was wandering in the land of the Kosalans together with a large Saṅgha of mendicants. Then the Buddha left the road, and at a certain spot he smiled. Then Venerable Ānanda thought, “What is the cause, what is the reason why the Buddha smiled? Realized Ones do not smile for no reason.”
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There are certain reasons for being joyful. Including the ones which make you smile. Remembering Buddha and understanding him is a reason to smile. Buddha himself smiled when he remembered his past lives... Only in one sutta nobody smiled and that was MN1 where he explained root of all things...
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The Buddha smiles many times in the suttas, in fond remembrance of experiences that brought great wisdom.
MN83:2.1: Then the Buddha smiled at a certain spot.
The Buddha does not smile at the suffering of others. His smiles are never cruel. His smiles are for the remembrance of great wisdom and insight that can be shared. The Buddha smiles for us all, never against any.
MN83:21.16: Ānanda, I say to you:
MN83:21.17: ‘You all should keep up this good practice that I have founded. Do not be my final men.’”
MN83:21.18: That is what the Buddha said.
MN83:21.19: Satisfied, Venerable Ānanda was happy with what the Buddha said.
The Buddha does have a manner of speaking wisdom that can lead others to smile as if in reaction to a deadpan joke:
AN8.63:1.2: “Sir, may the Buddha please teach me Dhamma in brief. When I’ve heard it, I’ll live alone, withdrawn, diligent, keen, and resolute.”
AN8.63:1.3: “This is exactly how some foolish people ask me for something.
AN8.63:1.4: But when the teaching has been explained they think only of following me around.”
Here, the Buddha is being completely serious, but his statement recalls our own folly and hubris. And we smile at the gentle remembrance of the depth of his wisdom, just as the Buddha smiled in MN83 at his own experience of escaping folly by means of the compassionate help of another.