BS”D (please don’t take this the wrong way)
I am totally against smoking and have never smoked and can’t stand it (to the point where I will walk out of a room if I smell it on someone’s clothes), but I agree with the OP.
It may be better to be married for the 30 years, if not longer, than to never get married at all. Its similar to people who marry men with physical defects (literally a Muckas Shichin), or women whose whole family had Yena Machla. In this case its even less of an issue, since smokers can quit. Sometimes you have to compromise, and although I and my family hope to never be in such a situation (Bezras Hashem), if the choice was marry a smoker or not marry at all, I would (probably) personally choose not (as I can’t stand the smell), but if you don’t mind it, you should at least consider it, especially if he is willing to agree to ground rules (such as no smoking in the house or around the children or yourself)
Since we believe that each person has their Zivug, if he is a smoker, it may be your only chance. If you are an older single and want to get married, you should at least give it a try. 🙁