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. Author manuscript; available in PMC: 2017 Dec 1.
Published in final edited form as: Drug Alcohol Depend. 2016 Oct 11;169:33–40. doi: 10.1016/j.drugalcdep.2016.10.005

Figure 2.

Figure 2

Mean ±SEM expired carbon monoxide (CO) levels for 15 participants who completed three conditions; own brand (OB), loose-leaf tobacco vaporizer (LLTV), and an electronic cigarette (ECIG). In all other respects the figure is identical to Figure 1.