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Table 4 Carcinogenicity classifications of chemical exposures found in cigarette smoke

From: State of the evidence 2017: an update on the connection between breast cancer and the environment

Chemical

IARC

NTP

Tobacco smoking: Active and passive

 

K

Polycyclic aromatic hydrocarbons (PAHs)

 

RA

Polonium-210

  

Benzene

1

K

Vinyl chloride

1

K

1,3-butadiene

1

K

Nitrosamine ketone (NNK)

  
  1. International Agency for Research on Cancer (IARC) classifications: 1 = Carcinogenic to humans, 2A = Probably carcinogenic to humans, 2B = Possibly carcinogenic to humans, 3 = Not classifiable as to its carcinogenicity to humans; U.S. National Toxicology Program (NTP) classifications: K = Known to be a human carcinogen, RA = Reasonably anticipated to be a human carcinogen. Source of exposure list contains most common exposure sources