How to deal with a smoking husband?

I’m trying to conceive for our first 👶. I read a lot all the articles about conceive and all mentioned should stop smoking. I’m nt a smoker myself, but my husband does. I keep on telling him to stop but he doesn’t listen. I want him to stop because good for his health also. One more thing about my husband, always go out with friends until late and surrounded by all the smoking friends. They asked him to purchase e-cigarettes and now purchase smoke tubes. I really cannot stand it. How can I make him to understand and stop for the good sakes of his health?