|| Occupational carcinogens
| Definitely known
||Insulation workers and shipyard workers are exposed to asbestos. There is some increase in risk of lung cancer after 10 years of exposure, substantial risk after 20 years of exposure. Concurrent smoking increases the risk to 90- fold.
||Smelter workers and vineyard workers are exposed to arsenic. The risk is dose related. Lung cancers have upper lobe predominance and there may be multiple primaries
|| Nickel refinery workers
|| Squamous cell carcinoma is more common.
|| Uranium mining. Oat cell carcinoma is more common.
|| Haematite mining
|| Due to radon exposure.
|| Hard rock mining
|| Chromium exposure in ore mining and pigment manufacturing: squamous cell is most common
|| Exposure in workers in industries: oat cell carcinoma is most common.
|| Ethers and mustard gas
|| Squamous and undifferentiated carcinomas most common.
|| Soots , tars
|| Exposure in coke oven workers.
|| Oils and coke
|| Exposure in gas house workers, roofers and rubber workers
| Suspected causes
||Acrylonitrite, berrylium, and dimethy sulphate