Loads of reasons:
Being allowed to smoke in the house (my fiancée doesn't smoke!)
Saving money....I don't feel the need to be constantly buying new equipment like some others on here....perfectly happy with my 901
Regained my sense of smell
No longer cough up a lung as soon as I've woken up
My clothes, hair, car etc no longer smell of smoke
Health improvements! (There....I've said it!!!)
As an oboist, I've found that my breath and diaphragm control have improved dramatically....almost back to the same level as when I was at music college, before I smoked heavily.
All these benefits and I'm only just a month into
vaping! I love it! Never EVER will I go back to analogs!!!!