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[25] was to stratify by cigarette status (current, former, or never) which allowed an examination of respiratory symptoms uniquely associated with e-cigarette use (i.e., among never-smokers, whose respiratory symptoms cannot be attributed to smoking history)

Primack BA, Bost JE, Land SR, Fine MJ

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I was initially worried about the fuse but the instructions are straightforward after looking at diagrams, just make sure fuses are in right place and the tap itself is 'facing' the right way

the average maximal FEV 1 values were 2.9 liters (L) and 3.1 L, respectively