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the claim

Smiling is contagious.

the verdict
INSUFFICIENT LEANING
Recorded sources
10 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that Smiling is contagious?

Unclear. Several popular and promotional sources assert that smiling is contagious, and one peer-reviewed study documents contagious smiling among young adults, but no placed source establishes the general claim with rigorous, representative evidence.

Verdict: PARTIAL LEAN · 10 sources for, 0 against · Last checked

Evidence for · 10
Social Cognitive Correlates of Contagious Yawning and Smiling.
2023
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KL, P. & HA, H. (2023). Social Cognitive Correlates of Contagious Yawning and Smiling.. doi.org. https://doi.org/10.1007/s12110-023-09463-1

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More for · 9
Wanted : contagious gameday staff : testing the effect of smiling on fan responses
2016
Get citation
V., L. B. (2016). Wanted : contagious gameday staff : testing the effect of smiling on fan responses. doi.org. https://doi.org/10.1080/15332969.2016.1156925

Ingroup-Outgroup Bias in Contagious Yawning by Chimpanzees Supports Link to Empathy
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Ingroup-Outgroup Bias in Contagious Yawning by Chimpanzees Supports Link to Empathy. (n.d.). doi.org. https://doi.org/10.1371/journal.pone.0018283

PubMed: "Celebration of the smile".
Get citation
PubMed: "Celebration of the smile".. (n.d.). pubmed.ncbi.nlm.nih.gov. https://pubmed.ncbi.nlm.nih.gov/2647242/

IT PAYS TO SMILE. (Poverty Bay Herald, 29 August 1908)
1908
Get citation
IT PAYS TO SMILE. (Poverty Bay Herald, 29 August 1908). (1908). paperspast.natlib.govt.nz. https://paperspast.natlib.govt.nz/newspapers/PBH19080829.2.111

Wellbeing at work: : Stress relief video ; 1: Relax with a smile
2010
Get citation
Wellbeing at work: : Stress relief video ; 1: Relax with a smile. (2010). aspresolver.com. http://www.aspresolver.com/aspresolver.asp?MARC;1782210

SMILE AND MEAN IT. (NZ Truth, 06 August 1921)
1921
Get citation
SMILE AND MEAN IT. (NZ Truth, 06 August 1921). (1921). paperspast.natlib.govt.nz. https://paperspast.natlib.govt.nz/newspapers/NZTR19210806.2.24.7

Laughter down-regulates negative emotional arousal amongst friends [version 1; peer review: 1 approved]
Get citation
Laughter down-regulates negative emotional arousal amongst friends [version 1; peer review: 1 approved]. (n.d.). f1000research.com. https://f1000research.com/articles/10-325/v1/pdf

Virtual Presenting
2023
Get citation
Cohen, J. & Sorrentino, M. (2023). Virtual Presenting. play.google.com. https://play.google.com/store/books/details?id=Jh2rEAAAQBAJ&source=gbs_api

Mindfulness For Dummies
2014
Get citation
Alidina, S. (2014). Mindfulness For Dummies. books.google.com. http://books.google.com/books?id=37ZYBQAAQBAJ&dq=Smiling+is+contagious.&hl=&as_pt=BOOKS&source=gbs_api

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held for human review17 Oct 2026
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