I. Am 79 years old and very active. I have emphysema and have some shortness of breath but feel good. I also have sleep apnea and have slept with a CPAP machine for 20 years. Recently, I have noticed a discoloration in my normal morning sputum, a grayish color about one morning out of three. We live in eastern Virginia on the water and use.dehumidifiders in our home to minimize mold. Is this enough information to give you some idea as to the seriousness of this recent change? Thank you for your time and interest. Charles Elliott. My e mail is YYYY@YYYY