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The quick answer to this question is Yes. Dentists can almost always tell if a person is a smoker or not, especially if the dentist has been practicing for a long time

"[Even] a mask with highly efficient particle-filtering material may confer little protection when worn," the authors wrote, in part because the masks often fit poorly and moved around while they were strapped to someone's face

The method really depends on the person

Leave Your Mess at Home by Tolani Akinola (Pamela Dorman) Akinolas debut takes a closer look at the American Dream through four siblings who reunite at their Nigerian immigrant parents Thanksgiving table after a decade apart

[PubMed: 12211517] Sonntag H, Wittchen H-U, Hfler M, Kessler RC, Stein MB

"Kevin Schwantz - 1993 World GP MotorCycle Championship Title Tables"