Ex-smokers didn't quit because they wanted to in most cases. They quit because they wanted to see their grandkids grow up, receive their retirement and be healthy enough to enjoy it, because they were tired of coughing, or any other reason for not smoking.
Many ex-smokers really didn't want to quit and they are jealous that we are able to have the look and feel, and satisfaction of a replacement activity that allows us to keep smoking and not experience the symptoms of tobacco smoking. I think they would like to try it in some cases, but have this feeling that if they do, they are back in the addiction ring, which, to some extent is true. We vapers are still addicted to nicotine.
I had a boss one time who had the reputation for hating smoking, smokers, and anything to do with it. I was told by others when he took over management of our team, that we wouldn't get along, since I smoked. What actually happened was that he recognized my skills and ended up promoting me to technical specialist and group leader. We would have to visit accounts together and usually rode in his non-smoking vehicle. I would smoke on the way to the car and on the way into a building, not in his car. He admitted to me once that, "Most of the time cigarettes stink, but once in a while I get a whiff and want one so bad that I could eat a pack of them!" His issues were based around the fact that he never really wanted to give it up but did it for his health.