SJSinNYC:
Assuming the alcaholic is not abusive and will not damage anyone or thing, then yes.
Bottom line is that they can make accommodations so that the smoking will not affect (healthwise) the rest of the family (as opposed to AIDS or the sort).
And yes, “older” Shidduch dating only women these days are that desperate. If they are not, they may have given up and expect never to get married (which may be a better option, but the other should at least be considered). At least as far as Middos, Children, Hashkafa, etc. they will be happy.
As yes, it makes me very sad (the shidduch reality) whenever I think about it.
Its not even close to the best option, but it should at the very least be an option.