GAW, I generally agree with what you write, but here I disagree.
I know (unfortunately) quite a few people who lost their spouses young and they agree that they are happy they married them. But why would you CHOOSE a situation that will endanger you, your children and extended family? A pregnant woman should not be around a smoker, even if they don’t smoke near the mother. Should a woman have to avoid her spouse for 9 months?
Also, smoking is assur. Would you allow your daughter to go out with a guy who eats at McDonald’s once a month? Or, knowingly does something else wrong? Why are there “acceptable” sins we tolerate?