This paper is marked retracted in the scholarly record (OpenAlex). Interpret its findings with caution.
Retraction Note: Tobacco-smoking-related prevalence of methanogens in the oral fluid microbiota
Ghiles Grine, Elodie Terrer, Mahmoud Abdelwadoud Boualam, Gérard Aboudharam, Hervé Chaudet, Raymond Ruimy, Michel Drancourt

Abstract
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Taxonomy
TopicsPediatric health and respiratory diseases
Retraction of: Scientific Reports 10.1038/s41598-018-27372-7, published online 15 June 2018
Editors have retracted this Article.
After publication of this Article concerns about ethical oversight of this study were brought to the attention of the Editors. The Authors were not able to provide documentation of approval from an appropriate ethics committee for the work reported.
Ghiles Grine, Elodie Terrer, Mahmoud Abdelwadoud Boualam, Gérard Aboudharam, Raymond Ruimy, and Michel Drancourt did not respond to the correspondence from Editors about the retraction. Editors were not able to obtain the current contact details for Hervé Chaudet.
