A.K.
I'm not a doctor but I work at a cancer center in San Francisco. This is what I've found out. The main cause of esophageal cancer is smokeing. Heavy drinking is also a factor. There was an observational study in India a couple of years back that said there was a corrolation between carbonated sodas and esophageal cancer. But like most observational studies it's hard to draw any real conclusions because there are so many other factors in play that can't be rulled out of the equasion. The prime example of this in the India study is that the increase in soda drinking corresponds to an increase in industrialization and $$. Industrialization leads to pollution which is a known factor in many cancers and $$ = health care causing an increase in diagnosis.