Wound Healing (video) R&D at British American Tobacco Share Print E-Mail Loading video... Caption When cells are untreated or exposed to e-cig vapor, the gap closes efficiently in a scratch-wound test. Wound healing is disrupted in the presence of cigarette smoke. Credit British American Tobacco Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.