Table 2 Polycyclic aromatic hydrocarbons: Per-puff concentration of e-cigarette vapour emissions, respective method air blanks and Ky1R6F cigarette smoke.

Vapour constituent	Unit	ePod1.0			Cigarette		Percentage reduction (%)
Vapour constituent	Unit	Air blank	BB57	BB18	Ky1R6F	BB57	BB18
Polycyclic aromatic hydrocarbons
Puff count	per consumable	50	50	50	9	-	-
Benzo[a]anthracene	ng puff^–1	< LOD	< LOD	< LOD	3.38 ± 0.06	99.9	99.9
Benzo[a]pyrene	ng puff^–1	< LOD	< LOD	< LOD	1.63 ± 0.04	99.7	99.7
Benzo[b]fluoranthene	ng puff^–1	< LOD	< LOD	< LOD	1.64 ± 0.11	99.5	99.5
Benzo[c]phenanthrene	ng puff^–1	< LOD	< LOD	< LOD	0.79 ± 0.02	99.7	99.7
Benzo[j]aceanthrylene	ng puff^–1	< LOD	< LOD	< LOD	0.28 ± 0.01	96.9	98.2
Benzo[k]fluoranthene	ng puff^–1	< LOD	< LOD	< LOD	0.51 ± 0.02	98.8	98.8
Chrysene	ng puff^–1	< LOQ	< LOQ	< LOD	3.40 ± 0.06	99.8	99.9
Cyclopenta[c,d]pyrene	ng puff^–1	< LOD	< LOD	< LOD	2.27 ± 0.11	99.8	99.8
Dibenzo[a,h]anthracene	ng puff^–1	< LOD	< LOD	< LOD	0.15 ± 0.01	95.7	95.7
Dibenzo[a,e]pyrene	ng puff^–1	< LOD	< LOD	< LOD	< LOQ	NC	NC
Dibenzo[a,h]pyrene	ng puff^–1	< LOD	< LOD	< LOD	< LOQ	NC	NC
Dibenzo[a,i]pyrene	ng puff^–1	< LOD	< LOD	< LOD	< LOQ	NC	NC
Dibenzo[a,l]pyrene	ng puff^–1	< LOD	< LOD	< LOD	< LOQ	NC	NC
Indeno[1,2,3-cd]pyrene	ng puff^–1	< LOD	< LOD	< LOD	0.68 ± 0.02	99.3	99.3
5-methylchrysene	ng puff^–1	< LOD	< LOD	< LOD	0.02 ± 0.004	92.5	92.5
Naphthalene	ng puff^–1	0.04 ± 0.01	0.18 ± 0.08	0.14 ± 0.10	131 ± 4.6	99.9	99.9
Pyrene	ng puff^–1	0.10 ± 0.01	0.11 ± 0.01	0.10 ± 0.01	9.34 ± 0.12	98.9	98.9

Values are presented as mean ± standard deviation (n = 5). Percentage reduction of e-cigarette emissions relative to Ky1R6F cigarette smoke. NC not calculated, 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).

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