I think there's an important point that is being missed here.
I don't think it's entirely "subjective" of me to say that
vaping is inherently more enjoyable than smoking. I'm fond of saying that neither do I think it's entirely "subjective" of me to say that I prefer getting hit on the hit with a small hammer as opposed to being hit on the head with a large hammer. I think that the latter "subjective" opinion is relatively universal, with the possible exception of people who are intent on harming themselves. I am also fond of saying that this latter group is just about the only one that
vaping cannot help.
One of my few friends who still smokes, and who tellingly (IMO) refuses to upgrade from his original eGo-T constant voltage battery in favor of the arguably more rewarding and satisfying variable voltage, also tells me that he considers himself "unforgiveable", and IMO continually punishes himself in numerous ways because of it.
If your friend had offered you a means of losing weight that was arguably (and actually more like "demonstrably") more enjoyable than eating chocolate cake, pizza, doughnuts, mashed potatoes and gravy, fried chicken, filet mignon, or whatever else anyone likes to eat, I could easily understand any frustration she might experience at someone's unwillingness to at least TRY it.
My strategy is to confront people head-on - kindly, lovingly, and forgivingly - with their "inner demons" that are keeping them from being kind to themselves, or the ones that make them somewhat unwilling to admit that someone might actually have a better idea than they do, or be thinking more clearly and rationally (which, not inconsequentially, vaping has been scientifically demonstrated to do for one).
I happen to believe that vaping is better than sucking in cigarette smoke, and I believe that I have science, logic, and reason on my side. I am a firm believer in using that science, logic, and reason - administered full-strength and repeatedly, but kindly, lovingly, and forgivingly - to help people stop killing themselves with cigarettes, and to start enjoying the proven medical benefits of nicotine ingested unaccompanied by the long list of toxins and carcinogens present in burning (and unscrupulously adulterated) tobacco leaves that I will omit here.