First of all there are two kinds of drugs, the one that is legal and the illegal. Drugs doesn't mean that it's bad or what, people always use drugs, such as pain killers etc. now the illegal ones are another story, I've never experience buying illegal drugs at any currency or never have I ever used any kind of illegal drugs, I'm in the philippines btw so weed is considered illegal here. But if you want to buy drugs using bitcoin there's always silkroad.