Fruity vs Ashtray!
Just as a "maybe" factor, if you have been sucessful in quiting smoking and you are happy and having fun, especially if you are getting into the hobby aspect of vaping....she could be a bit jealous. Its not uncommon that close friends and family can sometimes become jealous over others victories. Of course if you ask her, she'll never admit that but maybe just keep that in mind when she makes comments. Just let her vent and don't "over the top" defend your decision. I don't know you or your wife but maybe try and help her with a victory of her own, if shes trying to achieve something such as exercising or eating healthy or starting a new hobby of her own or learning something new or whatever. I had a friend that became jealous of me that I had lost weight and quit smoking and getting healthy and she got a bit down right nasty with me a few times on my vaping saying that I smell "weird" and I'm to stay away from her like stand 5 feet from her and such. I knew she was jealous and she did smoke and wanted an e-cig but couldnt afford one, so I got her a ego kit for around $35 and gave it to her as a present. Now shes all happy and loves the way we both smell lol! So maybe just think about it.