It occurs to me that if I'm to stop smoking. I already have but if I'm to continue to have success it would be nice to have something alternative to smoke. Cannabis? Well that's not going to work. Something else. Something that can and does actually help your lung function improve.
An outstanding expectorant, mullein lessens mucus formation and encourages the expulsion of phlegm, helping to ease the tightness of breathing. It also calms coughing fits and wheezing, and is often used for asthma and COPD.
An ounce of it on amazon, already naturally blended with other helpful and tasty herbs, will run you around 10 dollars. It should only be smoked continuously for not more than around 2 weeks from what I've read so far. You can also buy it and drink it as tea for it's benefits. Mullein, itself is tasteless.
Here are some random additional information links on Mullein;