Dahl, from the FL on your profile, I take it your an American, like me. We are unduly pressured in this All or Nothing society. Success comes in many gradients. Seems like huge change has taking place in your life, with vaping!! So take heart, our accomplishments should be measured by our own values and not others.
I am sure most of us know people who quit "Cold Turkey", and there advice to all of us was to just "quit", like turning off a light switch. Well, I don't work that way, it's not weakness or lack of resolve, its that solutions and the journeys there are different for each of us.
Ask yourself this - Would you be better off smoking 40 analogs a day or one? Are you closer to your goal, than you were before Vaping? Yes? Then at least at least acknowledge how far you've come. That last cigarette may just be the last vestige of a lifestyle (almost a relationship) that you've had for a long time. It's not easy, but so close, I am sure you can complete the journey.