Is it permissible to sell smuggled goods, knowing that the only licensed product is monopolized by an American company at five times the price of the smuggled one, and they are of the same quality, and the buyer knows that it is not American? And is the income generated from selling it unlawful?

Selling smuggled goods is valid if they were bought and sold correctly, and were not fraudulent or harmful to people. However, the sin does not depart from the smuggler and the seller if the prohibition of trading in them was issued by the legitimate ruler and was made for the benefit of the country and its people. If there is no real benefit from the prohibition, then it is not to be heeded, and the assessment of the benefit is left to the specialists.