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I used the E-Cig method to help me quit smoking. That was before I had mycobacterial pneumonia and bleeding lungs. After the pneumonia and a week in ICU was when I was diagnosed with COPD. I only used the E-Cig before that because I was able to slowly cut down the amount of nicotine in the e-liquid. There were 2 available liquids. PG and VG or a combo of both. PG being propylene glycol and VG being vegetable glycerin. I always used straight VG. It did make me have a hard time catching my breathe at times, but never made me cough. Since the FDA cracked down on the e-liquids, I am not sure what is available these days. Which liquid you use depends on your preference. I quit the E-Cig many years ago. Like a dozen or so years. I know the VG liquid makes the most vapor. The PG makes a lot less vapor but carries more flavor. After I stopped the E-Cig, I went the nicotine pouch route. That seemed to work pretty well for me. I could also control the amount of nicotine in the pouches. After the pneumonia, I quit nicotine entirely and have never gone back. You could also go the patch route to get your nicotine and slowly wean yourself from nicotine. I think that anything that you inhale into your lungs that is not oxygen, is probably bad for you. Have you talked to your medical team for help quitting? Nicotine is one of the hardest substances to quit. I am glad I did. Get some type of nicotine replacement that does not involve inhaling non-oxygen substances into your lungs. Good luck. Take care and God Bless!