Compound

Type of
toxicity^a

Amount in
sidestream
smoke per
cigarette

Ratio of side-
stream to main-
stream smoke

Vapour phase

Carbon monoxide

T

26.80-61 mg

2.5-14.9

Carbonyl sulphide

T

2-3 mg

0.03-0.13

1,3-Butadiene

C

200-250 mg

3.8-10.8

Benzene

C

240-490 mg

8-10

Formaldehyde

C

300-1,500 mg

10-50

Acrolein

T

40-100 mg

8-22

3-Vinylpyridine

T

330-450 mg

24-34

Hydrogen cyanide

T

14-110 mg

0.06-0.4

Hydrazine

C

90 ng

3

Nitrogen oxides (NO_x)

T

500-2,000 mg

3.7-12.8

N-Nitrosodimethylamine

C

200-1,040 ng

12-440

N-Nitrosodiethylamine

C

ND^b-1,000 ng

<40

N-Nitrosopyrrolidine

C

7-700 ng

4-120

Particulate phase

Tar

C

14-30 mg

1.1-15.7

Nicotine

T

2.1-46 mg

1.3-21

Phenol

TP

70-250 mg

1.3-3.0

Catechol

CoC

58-290 mg

0.67-12.8

2-Toluidine

C

2.0-3.9 mg

18-70

b-Naphthylamine

C

19-70 ng

8.0-39

4-Aminobiphenyl

C

3.5-6.9 ng

7.0-30

Benz(a)anthracene

C

40-200 ng

2-4

Benzo(a)pyrene

C

40-70 ng

2.5-20

Quinoline

C

15-20 mg

8-11

NNN^c

C

0.15-1.7 mg

0.5-5.0

NNK^d

C

0.2-1.4 mg

1.0-22

N-Nitrosodiethanolamine

C

43 ng

1.2

Cadmium

C

0.72 mg

7.2

Nickel

C

0.2-2.5 mg

13-30

Zinc

T

6.0 ng

6.7

Polonium-210

C

0.5-1.6 pCi

1.06-3.7