Table 2.

GC-MS peaks analysis of the e-vapors

Retention Time (RT)	Constituentsa	Retention Indexa,b (RI)	Vanilla Custard	Apple Jax	POG
2.392	Acetoin	713	✓
2.961	Propylene glycol	740	✓	✓	✓
3.59	3-Hexenol	857			✓
3.633	Butanoic acid, ethyl ester	802	✓
4.32	Butanoic acid, 3-methyl-, ethyl ester	854		✓
6.005	Glycerin	-	✓	✓	✓
6.102	Piperazine	-		✓
6.915	Cyclotene	1,034	✓
6.988	Benzyl alcohol	1,036		✓
7.183	Furaneol	1,070			✓
7.762	d-Limonene	-			✓
7.908	Phenol, 2-methoxy	1,090	✓
8.127	Butanoic acid, 3-methyl-, 3-methylbutyl ester	1,104	✓
8.254	Maltol	1,110		✓	✓
9.038	Benzene, 1,4-dimethoxy	1,168	✓
9.593	Ethyl maltol	1,199	✓	✓
10.401	Benzaldehyde, 4-methoxy	1,251	✓
10.625	Cinnamaldehyde	1,270		✓
10.703	Sulfurol	1,288	✓
10.776	Anisyl alcohol	1,290	✓
11.725	Pyridine	1,361	✓	✓	✓
11.881	2(3H)-Furanone, dihydro-5-pentyl-	1,363	✓
12.105	2-Propenoic acid	-		✓
12.154	Cinnamic acid, methyl ester	1,379			✓
12.397	Vanillin	1,404	✓	✓
12.942	Coumarin	1,441		✓
13.118	Ethyl vanillin	1,453	✓	✓
13.244	2(3H)-Furanone, 5-hexyldihydro-	1,470		✓	✓
16.691	Vanillin propylene glycol acetal	1,686	✓	✓

^aNIST 2017 MS database. ^bsemistandard nonpolar value.