Table 5.

Flavouring compounds and acids: Per-puff concentration of e-cigarette vapour emissions and respective method air blanks.

Vapour constituent	Unit	ePod1.0
		Air blank	BB57	BB18
Flavouring compounds
Puff count	Per consumable	50	50	50
1-Butanol	µg puff–1	< LOD	< LOQ	< LOQ
Benzyl acetate	µg puff–1	< LOD	< LOD	< LOD
Ethyl acetate	µg puff–1	< LOD	< LOD	< LOD
Ethyl acetoacetate	µg puff–1	< LOD	< LOD	< LOD
Furfural	µg puff–1	< LOD	< LOD	< LOD
Isoamyl acetate	µg puff–1	< LOD	0.76 ± 0.16	0.62 ± 0.04
Isobutyl acetate	µg puff–1	< LOD	< LOD	< LOD
Methyl acetate	µg puff–1	< LOD	< LOD	< LOD
Acids
Puff count	Per consumable	50	50	50
Acetic acid	µg puff–1	< LOD	< LOD	< LOD
Propionic acid	µg puff–1	< LOD	< LOQ	< LOD

Values are presented as mean ± standard deviation (n = 5). LOD limit of detection, LOQ limit of quantification. More information about the analytical methods and respective LODs and LOQs are under the Supplementary Information (Tables S1 and S2).