@liquidsky said
Check out this link by the American Cancer society. "Penile cancers are rare but most occur on the foreskin."
The article doesn't say that exactly. It actually states, and I quote -
"Almost all penile cancers start in skin cells of the penis."
Re squamous cell carcinomas - "Squamous cell carcinoma (also known as squamous cell cancer) can develop anywhere on the penis. Most of these cancers occur on the foreskin (in men who have not been circumcised) or on the glans. These tumors tend to grow slowly. If they are found at an early stage, they can usually be cured."
From the same source, the American Cancer Society, the estimated American penile cancer statistics for 2016 are -
* About 2,030 new cases of penile cancer diagnosed
* About 340 deaths from penile cancer
Source: http://m.cancer.org/cancer/penilecancer/detailedguide/penile-cancer-key-statistics
As for the risk factors, there are several, and it seems actually unclear whether being circumcised was significant. They even admitted in the article that
"In the end, decisions about circumcision are highly personal and often depend more on social and religious factors than on medical evidence."
Source: http://www.cancer.org/cancer/penilecancer/detailedguide/penile-cancer-risk-factors
I think when you consider that penile cancer is very uncommon, approximately 1 in 100,000 in North America and Europe, the statistics clearly do not support the idea that mass circumcision significantly reduces the risk. It would be better to promote good hygiene and not smoking.