Thanks @Jeana. I've been lazy and mixing the lye outside and not wearing one. I primarily make EO soaps - and I soap cool - but recently had some FO special orders and this thread has me thinking I need to have that respirator on. It really doesn't smell strong, but if I were to make bigger batches/several loaves at a time, it makes sense. I watch soaping videos, and I don't think one person I've watched wears a mask...very interesting. Excellent food for thought!