E-cigarettes contain dangerous 'popcorn lung' chemicals

Three in four e-cigarettes were found to use a flavored liquid that has been linked to severe respiratory disease, US researchers said Tuesday. Electronic cigarettes are battery-powered devices that heat a nicotine-containing liquid, which is inhaled much like a cigarette. Unlike traditional cigarettes, the devices are not regulated by US authorities, leading to concern among some experts that they may be harmful to health -- and that their candy and fruit flavors may appeal to youths and put them at risk of addiction.