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smoking rate has stalled at about 20 percent in recent years
And because even the FDA concedes that its regulatory guidance has evolved, it faces the charge that its conduct has been well short of ideal
Sample size An initial sample size calculation used the estimate of the within-arm SD of cigarettes per day from a pilot study (5.1 (95% CI [3.7, 8.2]: Additional File 1), which indicated that a sample size of 206 participants would give 80% power at the 5% significance level and a two-sided test to detect a difference of two cigarettes per day
Finally, our toothpicks are designed around what smokers actually needenergy, focus, stress relief, and behavioral satisfactionrather than just nicotine maintenance
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