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People who smoke e-cigarette and hookah are more than twice as likely to exhale particles through their nose compared with people who smoke cigarettes, who favor exhaling the emissions from their mouth, a new study shows. It is plausible that this tendency to exhale through the nose may put vapers and hookah smokers at risk for inflammation and cancers of the nose and sinuses and throat, conditions seen less often in cigarette smokers, according to the study authors.