SO quitting smoking!?

So i am currently 26 weeks pregnant, my SO has smoked cigarettes since before we even got together four years ago. So he has been smoking a while but just came to me and said he has really been thinking about how he wants to quit for our daughter before she gets here because he doesn’t want her around all the second hand smoke! This makes me so happy and excited because it’s been something that was stressing me out slightly because if he decided not to quit i would make him wash his hands every time before touching or holding her and also constantly changing his clothes. I was wondering if any other ladies have been in a similar situation, did you SO quit for real? and if so how are some ways i can in a way “reward” him, i know quitting cigs are pretty hard especially for smoking for years. i just wanna do little things here and there for him to show him i’m proud of him and truly appreciate him for doing that for our daughter!!! ❤️