Do you know people who have turned blue? Has you doctor warned you? Have you read something? Is it only the nasal spray that you're worried about or CS in general? Inquiring minds want to know.
I know of a couple of documented cases over the years, but those people took megadoses of questionable stuff. The senator that we hear about made his own with tap water and was drinking something like a gallon a day. I'm not sure of his name, but I think it was something like DUMB A**?