Scratch test -- wound healing disrupted by smoke but not by Vype e-cigarette vapor

(R&D at British American Tobacco) A new laboratory study reveals that cigarette smoke completely prevented wound healing at concentrations over 20 percent in a wound healing assay, whereas e-cigarette vapor had no effect, even at 100 percent concentration and double the amount of nicotine relative to smoke. The 'wound' was created in a cultured layer of of vascular endothelial cells. These are the cells that line the inside of blood vessels.