I smoked for a long time, switched completely to vaping several years ago and still do it. I started at nicotine level 24mg - supposedly the equivalent of a Camel or Marlboro - decreased gradually to where I'm now at the lowest nicotine level widely available in pre-made juices, 3mg.
Remember that nicotine at these doses is not harmful, nor is it a carcinogenic. What it is, is addictive, and the documented harm from the cigarette as a nicotine delivery system comes from the combustion.
With that in mind, I admit that I'm still comfortable with vaping after several years, my health has improved dramatically since then.
I can breathe much better, easier. Now I don't catch every single throat infection and flu of the season, and if I do catch one, it's now usually so mild that I don't even need medication to sleep with a clear nose.
What keeps me on edge is the pervasive anti-vaping sentiment, caused by the anarchic environment of the fledging vaping industry at the beginning, many nicotine delivery systems packaged EXACTLY like candy. A greedy gold rush attitude poisoned the well at the outset.
As an analogy, think Bitcoin and crypto.
Here's one out of my many "what was I thinking?" moments, this one from the eighties: A friend had this album that I taped and often listened to for at least a few months.
Andreas Vollenweider... "New Age" music with a harp at the front and center.