Which factor do you think contributes most to the development of cancer?

Cancer is a disease in which cells divide abnormally,uncontrollably and destroy body tissue.
Cancer has numerous causative and risk factors
Genetics play an important role in cancer as it is considered to be a genetic mutation in the body which leads to uncontrolled cells growth This mutation can be acquired as hereditary in most cases
Lifestyles choices like smoking , tobacco consumption , alcohol consumption and sedentary lifestyle increase the risk of carcinoma
Sometimes cancer can be caused due to exposure to chemicals like arsenic , trichloroethylene ,radon etc
Medical practitioner who are highly exposed to X-ray and radiation are also at high risk to cancer
So it’s best to say that cancer can be caused due to any of the following factors and likely a combination of all of them