It may be overkill if you are pouring just a few baits but I look at this way...
Safety first... too much is better than not enough any day of the week.
I don't get the headache's or bloody noses I was when pouring without the mask.
I don't have to smell the plastic or scent until I take the mask off so it is minimal time of exposure.
We only get one go round at life so why not be safe.