Is it permissible for a wife to buy cigarettes for her imprisoned husband so that he can use them as a bartering currency instead of losing his money?

What the husband wants from dealing in cigarettes by way of barter is forbidden, because it is an exchange of goods for goods, and it is stipulated in such an exchange that both goods must be permissible, pure, and beneficial. Cigarettes are forbidden and have no benefit. Furthermore, bartering with them is an aid to committing what is forbidden. Avoiding the potential loss of money due to coupon expiration is not a justification for dealing in cigarettes, as it is neither a necessity nor a need that permits engaging in what is forbidden. It can be avoided by estimating monthly needs or by searching for another permissible item.