As I read the description it's a part of the body, not designed for it, bathed in acid regularly for a prolonged period. The body's continual attempts at repairing this damage would give ample opportunity for mutations, possibly cancerous. GERD is something I'd never heard of 10 years ago and now I know any number of people diagnosed w/ it. (suspiciously concurrent w/ the introduction of drugs to treat it) Long term I'm sure they're will be a more definitive answer if only in terms of correlation. And probably an additional pill.
Wheat is the new tobacco. Spread the word.