What is the ruling on a wife and children eating from the husband's money if its source is the sale of tobacco?

Smoking is among the reprehensible, forbidden things, and trading in it, along with its financial earnings, is unlawful. If you are in dire need and possess no lawful money, you may take from the unlawful money only what suffices your need. However, if you have enough lawful money or the ability to earn lawfully, then it is not permissible for you to partake of this money. You must advise your husband to abandon this trade and replace it with a lawful one.