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. 2022 Aug 12;47(11):1939–1944. doi: 10.1038/s41386-022-01410-5

Fig. 4. Respiratory tract (RT) retention of nicotine after use of E-cig and C-cig and its association with Cmax of brain nicotine accumulation following E-cig vapor inhalation.

Fig. 4

RT retention of nicotine after use of C-cig and E-cig (A) was assessed at 25 min after inhalation of a single puff from respective 11C-nicotine–containing product and expressed as percentage of total absorbed dose (TAD). Right panel (B) shows the association of brain nicotine accumulation (Cmax) with RT retention after using E-cig (rs = −0.59, p < 0.05 after correction for multiple testing). For other correlations, see Table 1.