Agree with Zoffiel. The things that might be a potential contributing factor to something that may cause cancer is an endless list. Breathing is on it. If you ingested carcinogenic material on a daily basis, it might have an impact. Then again like my grandfather, a lifelong pipe smoker, you might live to 94 in robust good health. As a "fixer", I sympathise with wanting to have answers. Cancer has taught me a few things - to be a wee bit more accepting, to recognise that stuff happens and that not all bad stuff could have been avoided if......
it's also taught me that life after cancer can be very good. Look forward, not back. Best wishes.