Something like 20 years ago now, my pack-a-day wife decided to try a vaper. Not clouds-of-vape, just a pedestrian vaper.

She never went back to cigarettes. She decreased the nicotine and nowadays vapes maybe 2-3 times per day, I think her current level is 6.... whatever units of nicotine, it's not a lot.

I don't care that she still vapes at that level. If there is anything bad, it's not much at that rate, so screw it.