Vaping May Be More Dangerous Than Cigarette Smoking, Studies Show University Hospitals Can Vaping Cause Lung Cancer? Here's What We Know. Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Effects of ecigarettes and vaping devices on cardiac and pulmonary physiology Tsai 2020 The Journal of Physiology Wiley Online Library Friends' approval of e cigarettes may turn teens toward vaping, USC study suggests Los Angeles Times