With you overall, but given the toxicity of the fumes some quality / rated fume extraction might be the one area where cheap/self made item isn't worth it

If you're doing it a lot, then it's definitely worth making sure it works properly. If you're doing it occasionally, just make sure the area is well ventilated and you're not outright inhaling the fumes coming off the solder, and it's not likely to make any real difference to the health of your lungs.

Understatement.