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E-cigarettes (E-cigs) have received a considerable attention within the last years and are among the newest products for reduction of tobacco injury. Recently, it has been postulated that they are not considered a safe substitute for smoking and may have a limited degree of effectiveness in arresting smoking. Aim: The aim of this study was to detect the histopathological and ultrastructural changes of tissue architecture of the submandibular glands in rats after passive E-cig exposure.Methods: 12 adult male albino rats were divided into three groups (four rats each). Group I (Control group): Rats were exposed to fresh air. Group II (E-cigarette 4 weeks): Each rat was exposed to passive E-cig smoke for duration of one hour daily. The exposure time was divided into 6 equal intervals of 10 mins /hr, 7 days a week for four successive weeks. Group III (E-cigarette 12 weeks): Rats of this group were exposed to the same dose and manner of treatment of E-cig smoke as in group II for 12 weeks duration. Animals were sacrificed following each treatment period and specimens were prepared for histological examination and transmission electron microscopic study.Results: H u0026 E results revealed signs of atrophy and degeneration within the parenchymal elements together with dilatation and congestion of blood vessels with interstitial hemorrhage in 4 weeks E-cig exposed rats. More deleterious changes with marked distortion of the gland’s architecture were detected in 12 weeks E-cig exposed group. These data were supported by the electron microscopic results which reflected degenerative changes in cytoplasmic organelles. Conclusion: E-cig is not safe and its use to replace cigarette smoking cannot be recommended.

Histopathological and Ultrastructural evaluation of the Effect of Electronic Cigarette Smoke on the Submandibular Gland of Albino Rats