Hi,
Noted your history about having increased symptoms of difficulty in breathing at night,
chest pain, dryness of eyes and so on after you were exposed to residual smoke in friends house, no active
smoking done by your friend in your presence.
This seems to be the case of viral infection that you got after visiting the friends, as it is not known to have effect of residual smoke in someones house wherein there was no direct exposure as your friend was not smoking in front of you.
I would advise you the following in such a situation:
Consult your Doctor as you have severe symptoms for clinical diagnosis and supported by tests of blood and X-ray of the chest.
This will allow you to get a proper prescription for antibiotic, decongestants, anti-inflammatory medicines for symptomatic relief as well as for cure.
Surely you should avoid smoke as this can enhance or instigate your symptoms. Yes, some people are allergic to the cigarette smoke.
Also watch for any other factors thaat instigate or enhance your symptoms so that you can avoid further such factors.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T. Chandrakant, ENT and General Surgeon