I wife and I switched 8 years ago after forty years of two packs of Marlboros a day. Never looked back, and feel healthy as a horse.
I have a lifetime supply of concentrated liquid nicotine in the freezer and blend my own e-liquids at 10% of the cost of pre-made from vendors.
I suppose you can call me an FDA prepper.
In seven days, I’ll be eleven years without smoking. Smoked for 30 years prior.