Second hand cigarette smoke (SHS) is one of the major risk factors for cardiovascular disease (CVD) and has been shown to substantiate platelet activation and aggregation in several studies [1, 2]. Most of these studies, under chronic or acute exposure conditions or over prolonged exposure, do not represent the initiation of a disease state or hematological damage under normal levels of cigarette smoke. These above studies of platelet activation with SHS together with our previous in-vitro studies demonstrating cardio-protective effects of nicotine [3], have motivated the present investigation of physiological levels of SHS exposure on human subjects and within an in-vitro endothelial cell-platelet system, with cigarettes (or smoke extracts) of varying nicotine content to confirm analogous cardio-protective effects of nicotine.

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