Vaping + BJJ helped me finally stop. I finally stopped vaping after a few months when I realized I was hitting a plateau with conditioning for BJJ.

I smoked for 23 years and was diagnosed with COPD at about year 17. I still have serious lung issues but they do get better, slowly. Also I want to say that my body has adapted to function better in lower oxygen availability environment - as long as I don't burst cardio over a level I'm not accustomed to, I can keep it up for hours esp. endurance