No

Compounds

Percentage (%)

Classification

e-liquid (n = 72)

Aerosol (n = 72)

1

Propylene glycol

100.00

100.00

Alcohol

2

Glycerin

98.61

100.00

Alcohol

3

Piperidine

70.83

68.06

Amine

4

Nicotine

62.50

68.06

Pyridine

5

Ethyl maltol

44.44

55.56

Ketone

6

Vanillin

41.67

36.11

Aldehyde

7

1-Butanol, 3-methyl-, acetate

38.89

41.67

Ester

8

Ethyl Acetate

33.33

51.39

Ester

9

3-Hexen-1-ol

27.78

15.28

Alcohol

10

Butanoic acid, 2-methyl-, ethyl ester

26.39

31.94

Ester

11

1,2,3-Propanetriol, 1-Acetate

26.39

25.00

Ester

12

2(3H)-Furanone, 5-hexyldihydro-

20.83

41.67

Ketone

13

2(3H)-Furanone, 5-heptyldihydro-

16.67

27.78

Ketone

14

Maltol

16.67

15.28

Ketone

15

Triacetine

16.67

12.50

Ester

16

Menthol

15.28

13.89

Alcohol

17

Acetic acid, butyl ester

13.89

6.94

Ester

18

1,2,3-Propanetriol, 1,2-Diacetate

13.89

5.56

Ester