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Figure 4A shows a scatterplot of pack-year smoking history versus age at lung cancer diagnosis for BWHS participants with lung cancer who currently smoked at diagnosis (n = 242)

Nine of the 14 vapers had previously smoked tobacco but had switched to e-cigarettes for at least 6 months prior to the bronchoscopy

At the beginning, Carpenter intended to collect biochemical samples from participants in the Charleston area to verify their self-reports of smoking behavior

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