Maybe your fan is to "strong" and leads to a negative pressure near to your torch. This makes the fumes coming to your face before they are sucked off.
I have had that issues too and skimmed the whole LE threads about ventilation.
There are some very good explanations on how the set up should be to prevent this.
If I can find the threads I will post the links in here later.
What brings a lot of easing was building a Barley box.
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