I don't usually buy drugs but if you wish why not. It's safer anyway than buying on the streets from criminals
i also never use bitcoins for buying drugs but still there are such kind of people who are buying drugs using bitcoin and their number is not so more. they maybe few in numbers as compare to the total uses of bitcoin.
Me, I never buy drugs because I know it's bad for my life. People who sell drugs online are doing it for business and those buyers are usually at risk of being caught even though they are transacting in the dark market. If anyone think of buying drugs using bitcoin, you must exercise caution as in just one mistake your freedom might end and you will regret forever.