At this visit, participants will also receive brief behavioral support, provide a venous blood sample (10 ml) to determine plasma cotinine levels, undergo an exhaled CO test, and complete several questionnaires (see Fig
If a soft pack variant has a slightly freer draw, smoke can feel more immediate
95% CI, -1.73 to 3.57) but remained significant for current smokers with 20 or more pack-years in the original cohort (incidence rate difference, 6.62
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