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They don’t want you to know, but you can extract all the fumes and flavors using only your nose!
Seriously though, flux fumes do have a somewhat nice smell to them.
Depends on brand. And my head always hurts after inhaling them for more than a minute without a fume extractor. (I just use a PC fan and some old who-knows-what HEPA-like filter discarded from ventilation equipment. For quick jobs, I hold my breath and/or move out of the way.)