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When explaining how the device works, Loeffler said the e-cig creates an illusion of smoking, but that it doesn't contain all the harmful things real cigarettes have like tar, carcinogens or cancer-causing agents

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For example: Pack years = Packs per day multiplied by the Number of years smoked Pack years = 1.5 packs per day multiplied by 20 years = 30 pack years Examples of Pack Year Calculations Lets look at a few examples to illustrate how pack years are calculated in different scenarios