I dont know if the survey is done with fluoridated water or not. In that case I would start to worry, as this would contain the toxic form of fluoride. Normally tea contains the more natural form; calcium fluoride, which is less toxic, used by the body in mcg amounts.
Anyway; I drink my green tea whenever I like to.
I am well iodinated, it has to be worth something.
I would start with quitting the obvious, like fluoride in water, dental products and teflon pans.