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. Author manuscript; available in PMC: 2022 Mar 9.
Published in final edited form as: Prev Med. 2021 Jul 7;152(Pt 2):106714. doi: 10.1016/j.ypmed.2021.106714

Figure 2.

Figure 2.

Expired Breath Carbon Monoxide by Cumulative Vulnerabilities and Nicotine Dose Across Study Week

Upper panel (A) shows mean expired breath carbon monoxide (CO) values for each of the three cumulative vulnerability categories (low, moderate, high) collapsed across study weeks and nicotine-content-cigarette doses. Data points are means + SEM. Data points not sharing a superscript letter differed significantly in post-hoc testing. Lower panel (B) shows expired breath carbon monoxide (CO) values for each of the three nicotine-content-cigarette doses (0.4, 2.4, and 15.8 mg/g) at baseline and across study weeks. Data points are means + SEM. Data points not sharing a superscript letter differed in slope of linear trends across the 12-week study period.