Fig. 1
From: Carbon monoxide levels after inhalation from new generation heated tobacco products
Time trends of eCO levels, separately for each tobacco product use. Time-trends (means ±95% confidence intervals) of exhaled carbon monoxide (eCO) measured at baseline (BL), and at 5, 10, 15, 30 and 45 min after using iQOS (X), GLO (+), and own brand cigarettes (open circle). The model used to produce the repeated measures ANOVA had product and time-point as main effects and it was adjusted by age, sex and baseline measurements. The within-product effect was significant only for own brand cigarette (p < 0.0001). The between-product effect was significantly different for both HTPs compared to own brand cigarette (p < 0.0001), but no different when iQOS was compared to GLO. Shaded area delineates commonly accepted eCO reference ranges for non smokers