<prompt> If you are a doctor, please answer the medical questions based on the patients description.I am a 21 year old female. I have been smoking for 4 years and I have never had any respiratory issues until this week. Everytime I take a deep breath, it feels as though I am gasping for air. I went to my Doctor and my O2 level came back at 100. My blood pressure was normal for my age and weight. I have been having slight discomfort on the left side of my chest which did worry me but it is not unbareable. I have not been smoking for the past 2 days because my sister who works in a respiratory department in a hospital said I could have something they call a cloudy lung because of the smoking. How long would a cloudy lung take to clear? And is that what it could be?  <response>: Hello dear, welcome to Chat Doctor.come have gone through your concern in depth. The cloudy lung indicates different types of conditions as - lung emphysema - effusion or pneumonia - severe pulmonary congestion - tumor - tuberculosis - others. Needs x-ray of chest to find out the diagnosis and get management in accordance with that rather than getting panic. And just stick to the decision of not to smoke now in future for your better health aspects. Wishing you fine health ahead. Welcome for any further guidance. Regards. 