Stan I used to be like you and not worry too much about it. Then about ten years ago I was helping install a Detroit diesel in where a gas engine had been. The Detroit needed two top radiator out lets. So we used a hole saw on the tank. I them needed to braze a 2 inch nipple into the tank. I did not have any black iron ones only had galvanized nipples. So I heat the galvanized nipple up and brushed the shinny zinc off of it. I then brazed the nipple into the radiator.
That night in bed I woke up unable to catch my breath. Was only able to take very shallow breaths. Passed out trying to walk down the steps. My wife called the life squad and they rushed me to the hospital. They put me on oxygen and even then my blood oxygen levels where supper low. I was in the hospital for four days. My lungs still are not as good as they where before that. The Doctor told me it was all caused by the zinc/galvanized fumes.
So I will still weld/cut galvanized metal but only with a fan and or air supply mask. Doc told me if I got another dose like that one I would be pushing dirt.