Healthy hubby??

Charlene • I`m from a small town, and me and my hubby got married march 2013. Hoping for a miracle:) <3
I am trying to get my husband on board with kissing weight and quitting smoking to help our chances of TTC. He has been upset for a long time about his weight and smoking but never comits to doing anything about it. He gets irritated whenever I bring it up (no matter how I say it it seems) and shoots me down when I ask him if we can go for a walk or things like this. Please help