Is it permissible to sell calculators to cafes that sell shisha and cigarettes?

Selling calculators is permissible, unless the seller knows that the buyer will use them for an unlawful purpose, in which case it is not permissible. The same applies to every sale of permissible tools and machines if the seller knows with certainty or strong presumption that the buyer will use them for an unlawful purpose. The sale of shisha (hookah) and cigarettes is religiously forbidden, and selling anything that aids in that is aiding in the unlawful, because "it involves prohibiting aiding in falsehood." Therefore, renting a shop to someone who will open a shisha place, or selling tools, tables, and chairs to someone who will use them for unlawful purposes, all of this is forbidden if the seller or landlord knows about it.