Congratulations to you and your wife! That is a huge success story! You should be really proud of yourself.
At 3-5 packs a day, you have a very strong "hand to mouth" connection, plus, the cigarettes were present all the time. I've found that vaping does really well to satisfy both of those habits/cravings.
I didn't quit right away, either. Like you, I dropped down considerably at first, and after the first few weeks, I gradually lost interest in smoking as the vaping took over and was just as satisfying. More so because I didn't have to deal with the smell and smoke in my house, car and on my clothes. And I loved all the different tasty flavors!
Stick around ECF. I believe this forum and all the support you get from the wonderful people here really helps to keep you motivated and vaping happily.