What does "occasional" mean here?
Unless you are talking about more than an hour or two per week, or you are in a cramped space with zero ventilation, they are "nice to have" but I wouldn't sweat it.
If I really needed a fume extractor, I would use a recycled fan from a computer and a clothes-dryer vent and hose. if you REALLY are serious about keeping fumes out of your nose, then send them outdoors where they belong.