Congrats on your progress so far! For what it's worth, I had a similar situation. My husband was about 6 weeks behind me on getting off cigs completely. Between that and my mom being a heavy smoker, there were times it was difficult, but what kept me going was not wanting to reset myself back to day 1. I was proud of how many days smoke free I was and scared that if I picked up one it would lead to another and another. That and a very strong flavor like someone else suggested helped a lot (mine was a strong cinnamon fireball type).
Just hang in there and take it one vape at a time. I'm sure your hubby will catch up to you and go smoke free himself before too long. =)