I think vaping saved my life!
I do not think that is correct. Why do you think it saved your life?
Vaping allowed me to quit cigarettes.
Congrats, it is good to quite smoking cigarettes.  However, nicotine with vaping is still not great to do.
If it wasn't for vaping, I would have gone back to smoking a pack a day.
That is surely a progress but vaping isn't a completely harmless solution and you still consume nicotine while vaping, so I suggest you get help from being a smoker and strive to do your best to stop smoking, even vaping, completely. Try to do it slowly, but I think you should do it as soon as possible as it may be too late if you delay it.