I personaaly would not use it because there is evidence that Zinc Oxides can reduce sense of smell. This is common where galvinizing metal with zinc is done. And I have had it happen to me when I tried to weld a piece of metal that I did not get all the zinc coating off of.
Scary about the welding incident.
I probably would not use the product, given what is known about the risks, except that I have used it many times before with no side effects.
But it makes you wonder if there could be a cumulative problem.