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Model results predicted 47% of inhaled emissions were deposited in the <br />lung, mostly in the deep lung (RTI unpublished data) <br />Are the potential exhaled electronic cigarette emissions a potential <br />second -hand exposure? <br />Respiratory Deposition of <br />E- Cigarette Emissions <br />Exhaled <br />1% <br />6% - - - -�. Head <br />(nose and throat) <br />53% Tracheo- <br />40% Bronchial Region <br />Alveolar Region <br />(deep lung) <br />=_ <br />