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E-cigarettes are considered tobacco products because most of them contain nicotine, which comes from tobacco
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A valid instrument variable should only affect the explanatory variable, but not the outcome variables if not through the explanatory variables 35
Retrieved November 30, 2010
Longevity is excellent, sticking to skin and clothing like glue, lasting for more than 7 days on cotton fabric
doi: 10.1111/j.1572-0241.2006.00630.x 7
