E cigarette use to reduce cigarette smoking may not increase nicotine dependence Penn State University Lung cancer risks persist with e cigarette use after quitting tobacco smoking California holds youth vaping below half the national average while almost eliminating smoking Stanton Glantz blog Poll reveals split over benefits, risks of e cigarette use UPI.com Does E Cigarette Use Lead to Injuries and Illnesses? Chicago Product Liability Attorney Frontiers Electronic cigarette use and consumption patterns in medical university students