I do wear one at all times while torching. I have a stand-up bench, so it's just below chest height and the crud is closer to my nose than it would be if I had a sitting bench. I'm not terribly diligent about cleaning, so heaven knows what glass powder and such is drifting around the air.
Also, I work spontaneously, and may decide to put enamels or frit on a bead right in the middle of it. I found that trying to put a mask on in the middle of a bead is annoying, so I just wear it all the time now.
I went to an industrial supply place -- Acklands Grainger if you have them -- and bought a North half-mask, and I use the purple P-100 cans on it. I change them about every six months or so.
I do have ventilation, but still found my lungs hurt at the end of every session, so a mask it is.
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