That is the job of your legislature, you would need to contact them. One way that might make them listen would be to gather signatures and to present a petition to your lawmakers. The lower down on the totem pole you go, the easier it will be to make change. If you go to your city council meeting, you could try to get them banned in your city, and that might snowball into something bigger. That’s the idea at least, in all likelihood it would not be that simple. The “grey” market exists because of the legal ambiguity and lack of enforcement behind banning these substances. Furthermore, after prohibition and now the disastrous war on drugs, banning substances isn’t a very popular position in many areas. Harm reduction initiatives and increased funding for education might both be more effective, and be more popular. This all depends on where you live and your local politics.