I smoked for almost 40 years. After being diagnosed with COPD, I switched from smoking to vaping. That was almost 6 years ago. I have slowly decreased the amount of nicotine in my vape juice from 18 mg to only 3 mg. I tried 0 mg of nicotine but that just made me nervous all the time. I suffer from anxiety. Anyway, the 3 mg of nicotine has served me well. My COPD has improved. I now have better lung capacity than I did 6 years ago. While my doctor is not totally pleased that I still vape, it is so much better than when I smoked. Just getting the smoke out of my lungs has helped a lot. Please do not decimate the vaping industry.