Of course there are other chemicals than nicotine in there! Plant matter is made up of an astonishing variety of chemicals and when you burn it and inhale the smoke you are ingesting a wide variety of carcinogens.
For a long time people thought it was mostly the carcinogens collectively labeled 'tar' in tobacco smoke that was carcinogenic, but recent studies show that nicotine also has carcinogenic properties of it's own.
However, looking at it logically I think exposing oneself to a single carcinogen in low doses is a lot better than inhaling a smorgasboard of them in comparatively huge doses.
The stuff you are avoiding includes, but is not limited to:
* 4-Aminobiphenyl
* Benzene
* Cadmium
* Chromium
* 2-Naphthylamine
* Polonium-210
* Radon
* Vinyl chloride
* Formaldehyde
* Acrylonitrile
* Benzo[a]anthracene
* Benzo[α]pyrene
* 1,3-Butadiene
* Dibenz(a,h)anthracene
* N-Nitrosodiethylamine
* N-Nitrosodimethylamine
* Acetaldehyde
* Benzofluoranthene
* Benzo[j]fluoranthene
* Benzo[k]fluoranthene
* Dibenz[a,h]acridine
* Dibenz[a,j]acridine
* 7H-Dibenz[c,g]carbazole
* Dibenzo(a,i)pyrene
* Dibenzo(a,I)pyrene
* 1,1-Dimethylhydrazine
* Hydrazine
* Indeno[1,2,3-cd]pyrene
* Lead
* Lead 210
* 5-Methylchrysene
* 4-(Methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)
* 2-Nitropropane
* N-Nitrosodiethanolamine
* N-Nitrosomethylethylamine
* N-Nitrosomorpholine
* N'-Nitrosonornicotine (NNN)
* N-Nitrosopyrrolidine
* Quinoline
* iv ortho-Toluidine
* Urethane (Ethyl Carbamate)
And then there is the radioactive component of tobacco smoking that is eliminated, but that is a vast topic.
--- G.