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doi: 10.15585/mmwr.mm6544a2

Chromatographic separation was achieved on an Agilent SB-C18 column (1.8 m, 2.1 mm 10 mm) with a gradient elution program consisting of 0.1% formic acid in water (mobile phase A) and 0.1% formic acid in acetonitrile (mobile phase B) as follows: 0-1 min, 5% B

Seeing it laid out like this makes the distinctions much clearer

Previous studies 13,522 have suggested that smoke-free workplaces can reduce smoking prevalence by up to 10%

However, the methodological changes in 2020 because of the COVID-19 pandemic have created major challenges for survey researchers and other data users in interpreting estimates from the 2020 NSDUH