My wife used to gripe about my cigar smoking before, mostly for health and financial reasons. It sounds like this is different from your wife, but here's a few things that have helped us (me).

The biggest has been her seeing my friends and family who smoke. We once went to a weekend family getaway and she saw my grandfather, and two uncles smoke several cigars a day. That made her put my couple times a week 'hobby' in perspective. It also helped for her to see how my friends enjoyed it when I'd pass out cigars and smoke with friends at a get together. She also appreciated the bonds it creates over the board here, how we trade, bomb, participate in contests, recommend cigars, etc.

She also didn't mind it as much after she smoked a cigar. She hated the cigar, but kind of understood while I like it and how it's relaxing. I talked about how cigars are made, the pride people take in making them, and all the different factors and complexity that go into a single cigar. Really how making a cigar is an artform, and when you smoke a great cigar you are enjoying someone else's pride and work. This may be harder for you to do, since it sounds like your wife is already pretty opposed to the smell of cigars. I went with the asking a bunch of times and telling her once she did it I wouldn't bother her again.

Good luck.