Hi i am a smoker, between 10 and 15 a day, and i have noticed that, especially when i go to bed, i get wheezy. At 15, i am now 40, a locum told me i was asthmatic although i have never had an asthma attack in my life and take no medication. I do a physical job and excerise quite  a lot and notice no breathlesness then but whilst having sex, i am afraid!!, i am breathless after a relatively short period of time. In the mornings normally after two or three cigarettes i cough up a mucus, not a huge amount, that borders between clear and light yellow in colour, are these symptoms just due to smoking or could it be something more serious, i am trying to quit!!
Thanks for your question on Chat Doctor. I can understand your concern. Nighttime wheezing (whistling sound from chest), morning cough with expectoration, breathing difficulty during sex etc. are suggestive of early bronchitis. Active smokers are at increased risk of bronchitis. So better to quit smoking as soon as possible. Get done PFT (Pulmonary Function Test). If PFT is showing obstructive defect then you will need inhaled bronchodilators (formoterol or albuterol) and inhaled corticosteroid (ICS) (budesonide or fluticasone).Don't worry, you will be alright with all these. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.