If it was many days ago and you have no observable symptoms (like cough) you should be OK. Gases that are emitted are strong irritants and they can quickly destroy tissues, but I am not aware of delayed effects (at least if it is just a random exposure, not something repeating every day).
A bit like contact with something hot - you were either burnt to the point of needing medical attention, or it was just unpleasant but no need for a doc.