I wouldn't trust zinc in my nose either.
For me the outcome outweighs any possible risk with iodine. I used Nascent Iodine which I think is a very safe and effective form of Iodine for my sinus rinses and have used this in my eyes as well as ears over the last several years on occassion. I would think if anyone would do enough of anything there might be ramifications so for people to go gung ho and use without any common sense would not be a very good idea.
I'm not sure what your point is other than to warn me of something I've already done, or perhaps you are warning others. There is danger in all sorts of things but the real danger is to keep seeking medical advice for my body, which is my right to choose how to treat it and side step mainstream meds that have proven nothing but antagonistic for me and many others. In any event, it's okay, I'm okay and thanks for your input.