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What are e-cigarettes? E-cigarettes are battery operated nicotine inhalers that consist of a rechargeable lithium battery, a cartridge called a cartomizer and an LED that lights up at the end when you puff on the e-cigarette to simulate the burn of a tobacco cigarette. The cartomizer is filled with an e-liquid that typically contains the chemical propylene glycol along with nicotine, flavoring and other additives. The device works much like a miniature version of the smoke machines that operate behind rock bands. When you "vape" -- that's the term for puffing on ..

The electronic cigarette was invented in the 1960s, but it didn't really take off until a decade ago. Currently, there are more than 250 brands of "e-cigarettes" available in such flavors as watermelon, pink bubble gum and Java, and in more colors than the iPhone 5C. ..