So much that could be done with those. Mandating age checks. Covering at least 80% of them with warnings about gambling. Maybe plain packaging and only allowing them from behind counter or unmarked automated systems. Treat them as tobacco products.
You can just ban them. Pass a law that says if someone buys an item the identity of which is undisclosed, and they're not happy with it, they're entitled to a full refund.
OK, we mandate age checks. But what is the minimum age? Am I in trouble if I make a straw purchase of that product for someone else?