I would never buy drugs period, because I don't do any drugs and really don't drink alcohol either.
That being said, watch out buying thing on the block chain that is public. There is a tool called blockchainanalysis that the governments are using to find people who do stuff like this. be warned!
Because it's public, it's easy for the government to find out who are the transacting party, remember that they have the resources and you should
know what you are doing to ensure that you will always be safe, doing some illegal activity needs you to be smart in order to be safe all the time.