[smt88]

Less than 15% of lung cancers occur in people who haven't smoked. A lot of the rest of the risk is radon.

It's not unreasonable to think there might be a connection.

[refurb]

As others have mentioned asbestos increases the risk of a very specific type of lung cancer.

People don’t seem to realize that there isn’t a cause for every case of cancer. Sometimes you just get cancer even having never been exposed to any risk factors.

[assblaster]

Asbestos is linked more with mesothelioma.