I also have chest pain, I think my huffing is too aggressive but if I don’t cough/huff deeply I get nothing. I wish I could find a respiratory therapist that would properly train me… I don’t want to hurt my lungs. I use albuterol and 3% saline and watch videos but still can’t get things to move without practically choking up a lung. I’ve complained to my Dr and they just laugh it off! Went to my heart doc. thinking the chest pain was my heart and had echo but all looked ok.