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Figure 1 Time Course of Plasma Cotinine
Cotinine levels significantly increased immediately after SHS exposure and remained significantly elevated until 24 h. No increase was seen after exposure to clean air in the chamber. Symbols are mean ± SEM. *p < 0.05 versus baseline of same day (exposure condition). #p < 0.05 comparing SHS and clean air at the same time. B = baseline; SHS = secondhand smoke.
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