I have a mate that transports hazardous substances for a living. Among them sulphuric acid, much much more concentrated than in marquis reagent. He had an accident a while ago where he inhaled a substantial amount of fumes. His throat and lungs had burns on them. That was about a year ago and he is fine now, the damage has completely healed. This to say that even in extreme circumstances the damage heals. You will be fine, no worries