This is still not a popular thing in the crypto currency market. These sort of things will take time to create a buzz because these sort of things are very hush hush. Give it some time, things might turn around. This may, slowly over time, peak interest in people too.
if we say in fact the question asked, then I do not understand what is common between drugs and crypto currency. It seems to me that drugs are so well suited, even without the help of a digital currency.
The way i see it a related crypto would help making it safer market. After all, it's still a drug and people might not want to have their purchases displayed to the public. Let's say a country goes back to having marijuana illegal and a guy has his past dug up to show he bought it before: it could damage his career.