Fig. 1
From: Market survey of disposable e-cigarette nicotine content and e-liquid volume
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12889-022-14152-2/MediaObjects/12889_2022_14152_Fig1_HTML.png)
Percent Difference of Labeled vs. Measured Nicotine Concentration (N = 51). Comparisons of nicotine percentages using common units of mg/mL were made using an e-liquid density correction to convert nicotine mg/g to mg/mL. Density data are not shown. Measured nicotine concentrations (Grey Area) were lower than labeled nicotine concentrations (Outlined Areas) for the majority of evaluated commercial disposable/non-chargeable e-cigarette products. The percent differences from the label (Figure 1, right column) ranged from -50.1 to 13.9%