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Options like twist-style batteries give users more control over voltage, while full kits help keep the battery and cartridge pairing clean and convenient

Two related studies, one in humans and the other in rats, found that the cardiovascular effects of cigarettes and e-cigarettes are strikingly similar, and these harmful effects on blood vessel function are likely caused by airway irritation due to inhalation of a foreign substance, rather than a specific component of the cigarette smoke or e-cigarette vapor (aerosol), according to new research published today in the American Heart Associations peer-reviewed journal Arteriosclerosis, Thrombosis and Vascular Biology (ATVB)

Sales doubled last year to more than $500 million, says research firm Mintel Group Ltd., though some analysts estimate that sales of e-cigarettes topped $1 billion