I think I agree with Andy. Just to say wood dust is explosive isn't telling the whole story and scaremongering doesn't really help the correct message to get through. Looking at this the other way round, if wood dust was really that explosive, motors on all electrical tools would need to be sealed to prevent a spark igniting airborne dust. We already know that isn't the case.
Going back to the original question about CA fumes, I recall someone saying they were overcome by CA fumes because they were wearing a powered (dust filtering) respirator because the belt mounted air intake was sucking in fumes where they were most concentrated. Obviously they should have been using a chemical respirator but this is just an example of what using the wrong PPE can do.
Personally, I dislike CA as a finish so I never use it. Problem solved!