I think the company posted the most common foods and drinks consumed while driving, hoping that people who have no knowledge of statistics will stop consuming those specific foods. It's not the food itself, it's the act!
I doubt public baths were chlorinated back in the day.
I don't think stem cells are found in blood- just umbilical cord blood and bone marrow. It would be rather difficult, I think, to extract bone marrow from a person without their knowledge.