Last time i had a medical checkup, x-ray photos of my lungs showed some white spots on them, the doctor asked me if i smoke and this is mostly caused by smoking, but i didn't smoke and he said this is probably due to high reception of second hand smoke or just because my lungs are more sensitive to these chemicals. Any ideas about this? As far as i remember, i don't hang out with smokers that much and only for a short period of time i had a smoking roommate (10 weeks) and he rarely smoke inside the room. Is there any other possible cause of this symptom? And whatever if any, treatment or actions to be taken to reduce or get rid of this problem?
Thank you very much for reading, any help or response will be greatly appreciated