Well, after reading an encyclopedia a week ago, and learning about the respiratory system in Biology, a few months back, your alveolis seem to be clogged with mucus, which may be causing a minor infection. You should just give your lungs a break from smoking. This will give the alveolar macrophages-scavenger cells that gobble up smoke particles-time to begin some sort of lung repair.

Ed Rosensthal
The particles are held here for long periods of time-months, or even years, as succeeding generations of scavenger cells ingest the debris released by dying macrophages.
Invest in a vaporizer.