especially when on the subway (the air is shitty, so it makes sense).

Man, having had easy access to some sort of mask for a long time now, I keep finding little situations where historically I'd be like "man, I wish I didn't have to breath this shit, it can't be good for me" where I just don't breath those things anymore...

I'm trying to think of good examples but the only one that comes to mind is that in the rare instance I need to use bug spray I'm always glad I have a mask I can wear in case it floats my way.