COPD may well be the REAL killer, but it is entirely, 100% (IMHO as always) one of the WORST ways to die. People with COPD are MISERABLE. When I went to see my retirement community, she said, "Oh, gosh, we don't tend to see the folks with COPD much, they stay in their homes due to lack of mobility.
The guy I got my small lathe from had emphysema. Used to always be at the shop where I shoot to work on his big lathe (always smoking). Ended up he couldn't even work on the little lathe in his own garage. Moved to FL (I can't breathe in FL without lung problems) and died in a few years.
I got pneumonia a year or two after vaping, not on immune suppression yet (although my Ducktor at the time said it was, it's not), I was barely exposed to any humans to get any germs. Turns out people with IBD are at higher risk for pneumonia. I didn't even know it, I was staying in bed with a high fever waiting for my Dr appointment to roll around, I was breathing fine. He sent me to the ER.
It was after they gave me antibiotics that I couldn't breathe for weeks and standing up in the heat was a blackout for a year. The slight wiff of cigarette smoke shut off my breathing instantly for a couple of weeks. I was able to vape lightly.
I have not had a cold or anything like that since going on immune suppression. Hand sanitizer in my pocket, a mask if anyone seems sick or a crowd is too big to judge, refusal to shake hands or hug and gloves if I can't avoid touching someone. The added paranoia must help.
Although I found out I probably got the pneumonia from myself, we have the germs inside and sometimes they make it into our lungs.