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Effects of switching to electronic cigarettes with and without concurrent smoking on exposure to nicotine, carbon monoxide, and acrolein

A pair of new studies by research teams headed by Debora Groppetti of the Department of Veterinary Medicine and Animal Sciences at the University of Milan explored the effects of nicotine from second- and third-hand smoke exposure in purebred dogs

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Abstract The lungs, in addition to participating in gas exchange, represent the first line of defense against inhaled pathogens and respiratory toxicants

Theyre just borrowing the meaning.