EndGame: This "takeaway" seems to my untutored eye, to be intuitively correct. It stands to reason that the periodic ingestion of large amounts of what many agree can be a toxic chemical would create a risk of serious medical conditions. The only doubt I have is spending a significant amount of money for a survey to reach that conclusion. Reminds me of the tale told in my childhood of the mother who cautioned her kids not to "stuff beans up your noses." She went out and when she returned her kids all had beans stuffed up their noses.
W.