Thanks Banger, that’s my thinking. I’ve found a few rumours/reviews saying the cheap carbon filtered extractors do no good, including a product evaluation that appeared to be sponsored by some element of the US Govt.
But equally, it’s hard to believe they do any harm, even if it’s just a process of drawing the smoke away from my face and towards the open window. It has to be better than nothing.
I’ve looked at the more industrial HEPA filtered extractors but they cost many hundreds of pounds, and usually seem to be huge - like a large fan assisted dustbin, with ducting to the bench, sitting under the desk.