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They have been marketed as alternatives to smoking cigarettes

With light cigarettes, the design of the cigarette is altered in a way that could, in theory, deliver lower amounts of nicotine if they were used in a specific way, said William Shadel, associate director of the Population Health Program at Rand Corp

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Additionally, other chemicals often used in many e-liquids such as propylene glycol (PG) can result in further respiratory problems if inhaled in large quantities