Yes. SO2 is not so strong respiratory irritant compared to other irritants e.g. SO3 or chlorine, in terms of acute inhalation.
However, a serious impact on the respiratory tract and lungs, as well as eyes irritation occur under prolonged contact with.
If you prepare a sodium bisulfite solution by dissolving sodium metabisulfite in tap water and you smell it, it has unpleasant odor but you will not immediately start to cough.
Besides, the preparation of aqueous NaHSO3 from Na2S2O5 is endothermic, therefore sedimentation occurs under heating e.g. by simultaneous oxidation to NaHSO4, which is exothermic (white foam?)