I totally understand your concern.,I am a smoker for 10yrs but not a heavy smoker(~12cigs/day).
I read it on the internet and thought of sharing the knowledge to fellow e-smokers. check 19. - use of vinegar.
19. To clear up respiratory congestion, inhale a vapor mist from steaming pot containing water and several spoonfuls of vinegar.
make-stuff.com/cooking/vinegar.html