Wow...this is my story...but I married him. You are doing the right thing for you sweetie. It took me a long time to figure it out and I finally gave up and left too, but not until after about 25+ years. It is lonely and crazy making to live with someone who smokes all the time. It kills me that people say it doesn't affect you like "real drugs"...BS.... they have never lived with someone who smokes.
Stay strong... take care of you. Know that it feels great to not have that in your life. Also, know that it can happen again.... I met another great guy who turned out to be a heavy drinker... not for me. I won't live with someone who is not 100% there. I deserve more, so do you. Hugs