Both groups steadily decreased the mean nicotine concentration over time; differences between exclusive e-cigarette users and dual users at Weeks 1, 2, 4, and 8 did not reach statistical significance ( Figure 2 ; Supplementary file Tables 1 and 2).
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E-liquid flavors and nicotine concentration choices over 6 months after a smoking cessation attempt with ENDS: Secondary analyses of a randomized controlled trial.
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