It turns out, yes. There is a theory that our brain analyzes mimic activity and in response to this, it is much easier to trigger the appropriate reactions inside.
For example, if we ALREADY smile, then the told joke will seem much funnier than if we listened to it with an angry or sad expression on our face.
We kind of train the muscle of our smiling and stimulate a positive attitude inside us.

The theory is interesting, but there is one BUT.
This hypothesis was put forward by the German psychologist Fritz Strack, who, many years after his research, received the Schnobel Prize for the fact that he himself refuted it. He expanded the study and found that the experiment did not produce such results in a wider sample of subjects.
However, during this time, the world managed to believe in the power of a smile, so the effect really was! I also like to believe in the veracity of this theory. Smiling makes it much easier to jump from negative to positive, and smiling becomes a habit!
Even if science has not confirmed the experiment, a smile has at least one more undeniable bonus. In addition to internal feedback, smiling elicits external feedback - you are much more likely to receive a response and a friendly attitude if you are friendly and smiling. It works in marital, parent-child and business relationships ...
When we smile, the chameleon effect is triggered: the interlocutor involuntarily copies our mood and relaxes. This is a word about the infectiousness of a smile. Let's check the experiment for ourselves?
Try to set aside 15-20 minutes a day to smile. If you are shy, start at home, and in a day “put on” a smile on the street and “do not take it off” within a given time.
The result will definitely be!
Are you a smiling person?
Do you believe in the power of a smile?