This entire thread reminds me of the story with (I believe it was) R’ Chaim Volozhin Z’l, who one year got a much smaller donation from a “regular” than usual. When asked, the donor replied, you used to come collecting on foot, this year I see you have a horse. I dont want my money to go for the horses provisions, I want it to go directly to the yeshiva and the bachurim. He replied, this is part of the chachma hashem gave to Betzalel when constructing the mishkan. What donations were used for the things like the aron, mizbeach etc, and what for the hooks on the curtains and what money to feed the sheep that would be brought as korbanos. He told the donor you give the way you used to, dont worry about how it will be used.
This is brought down in (if I am not mistaken) “Majesty of Man” Parshas Terumah.
Dont worry if he smokes, you worry about being mikayem the mitzvah of tzedaka. Hashem will work out the rest. Of course if you have a question whether it is tzedaka altogether, that is why you have a Rav.