I think they should just make a "Pfand" system for them like we have in germany for plastic bottles. You pay 1€ or 2€ more and you get the money back when you bring it back to the store. That way they can be recycled, which should be pretty easy anyway since you just need to replace the cotton and put new liquid into it. Banning them wouldn't be a good idea IMO because it's pretty easy to order them straight from China and not pay any taxes, so people would probably do that and sell them on the street. If more people do that, it will also be a lot easier for kids to buy them, which is already happening but this would just amplify it because there would be more sellers.