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Cigarette smoke contains over 4,700 chemical compounds, including 60 which cause cancer. Many toxic agents are also in cigarettes, some of which are manufactured during the smoking process itself. A lit cigarette generates more than 150 billion tar particles per cubic inch, making up the visible portion of cigarette smoke. According to chemists at R.J. Reynolds Tobacco Company, cigarette smoke is 10,000 times more concentrated than the automobile pollution at rush hour on a freeway. Visible smoke, however, contributes only 5-8% to the total output of a cigarette. What you can't see are the so-called vapors or gases in the cigarette smoke. That is, besides nitrogen and oxygen, toxic gases such as carbon monoxide, formaldehyde, acrolein, hydrogen cyanide, and nitrogen oxides. There are countless more.

The carcinogens in cigarette smoke include:

Acrolein, 4-Aminobiphenyl, Aromatic Amines, Aromatic Nitrohydrocarbons, Arsenic, Benzene, Benz{a}anthracene, Benzo{a}pyrene, Benzo {b}fluoranthene, Benzo {c}phenanthrene, Benzo{e}pyrene, Benzo{j}fluoranthene, Cadmium, Chromium, Chrysene, Dibenz{a,j}acridine, Dibenz{a,c}anthracene, Dibenz{a,h}acridine, Dibenzo{a,h}pyrene, Dibenzo{a,i}pyrene, Dibenzo{c,g}carbazole, Dichlorostilbene, 4-Ethycatechol, Formaldehyde, Hydrazine, Indeno{1,2,3-cd}pyrene, Methylchrysene, Mehtylfluoranthene, Mehtylnaphtalenes, 1-Methylindoles, 3-Methycatechol, 4-Methycatechol, 4-Methycatechol, 4(methylnitrosamino)-1-(3-pyridyl)-butanone, 2-Naphthylamine, Nickel, Nitropropane, Nitrosodimethylamine, Nitrosoethymethylamine, Nitrosodiethylamine, Nitrosodi-n-propylamine, Nitrosodi-n-butylamine, Nitrosopyrrolidine, Nitrosopiperidine, Nitrosomorpholine, N'-Nitrosonornicotine, N'-Nitrosoanabasine, N'-Nitrosoanatabine, Polonium-210 (Radon), Urethane, Vinyl Chloride.

Additionally, every cigarette you smoke, floods your body with over 1 million 'free radicals' (altered Oxygen molecules which attack all the cells in the body.

US Surgeon General Reports, the International Agency for Research on Cancer (IARC)