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. Author manuscript; available in PMC: 2023 Jan 30.
Published in final edited form as: Addict Behav. 2018 Jan 11;80:65–70. doi: 10.1016/j.addbeh.2018.01.012

Fig. 1.

Fig. 1.

Upper: Cigarettes per day across time. Standard error bars are shown. Change from baseline was analyzed at 6 and 10 weeks, *p < .005; ** p < .001. Lower: Expired carbon monoxide (CO) across time. Standard error bars are shown. PPM means parts per million. Change from baseline was analyzed at 6 and 10 weeks, * p < .005, ** p < .001.