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. Author manuscript; available in PMC: 2016 Oct 1.
Published in final edited form as: Addiction. 2015 Jul 21;110(10):1667–1675. doi: 10.1111/add.12978

Fig. 4. Plasma Cotinine by Group.

Fig. 4

Mean plasma cotinine concentration over 24 months of the study in smokers smoking their usual brand of cigarettes (C) or during progressive reduction of nicotine content of cigarettes (R). The bars represent SEM.