When it comes to giving up smoking, the choice to do so can usually come with a lot of fraught thinking about how you'll pass your time, and what you'll do once you're not a smoker. This can sometimes be the reason a lot of people fail at giving up, because that one last cigarette, never becomes the final one.
The difference between deciding to quit smoking and making the switch to vaping is that you don't need to make a decision of giving up once and for all. That one last cigarette doesn't come, you just change what you're using, that's all.