PEEP?: Depending how you mean it, if friend has any respiratory disorder, lip-pursing can increase end-expiratory pressure (the -eep of peep), which helps keep alveoli open and improve gas exchange in the lungs. Or, might just feel subconsciously comforting to him/her? Doesn't sound.
Answered 5/17/2016
5.2k views
Not a disease: Pursing ones lips is a habit, not a disease.
Answered 10/13/2019
5.2k views
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