E cigarette use to reduce cigarette smoking may not increase nicotine dependence Penn State University Vaping may raise cancer and heart disease risk, study suggests Medical research The Guardian E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA Researchers Note Latest Vaping Concern: 'Hacked' E Cigarette Devices News Yale Medicine Some E Cigarette Flavors May Be More Harmful Than Others The Atlantic