You're going to want to keep in mind that any appraisal you get is going to be very subjective. I might think it's worth $xx. Someone else might say $x,xxx.
Think of this this way. Today's culture is rather accepting of vaping at the present time (at least where I live), and I see this trend continuing until some health epidemic presents itself, or similar. As such, "Quit Vaping" is not a commonly-searched term. To the contrary, search engines probably get lots of searches for "where can I get those sweet sweet vape pens so I can smoke them all day".
Any domain is only as valuable as a reasonable end user can market it to be. Until there are enough reasonable end users who want to use your domain as a means to market to those people who want to quit vaping and, thus, will bid the price of your domain up to an amount you want to see in this thread, I think you're going to be disappointed with any number you get. That is, if the person is honest in their appraisal.
I think it's a good domain, for the right time. You've had it for a few years and it might be getting itchy. Perhaps you're interested in selling it for what you can get for it, today. Personally, I don't think you're going to see a number you hope to see. It's just not time yet. Too many people are very happy with their vape pens. The demand for your domain is not there.
But I think the .com is a good domain. Again, that's all the feedback I can offer, with a little more background as to why.