As long as you are not hurting anyone else and everything is above board, why? Seriously, if someone is at home smoking weed and having sex with a hooker for a price they both agreed to and are happy with, why should that concern me at all, nevermind bother me?
Prostitution maybe not, but drugs literally do no good to anyone.
One can be classified as a job as long as it's properly regulated, while the other is nothing but a poison people use to cope and ruin themselves in the process
They do. They actually ruin life for them and their families. And I forgot to mention that drug addicts can be extremely violent to the point of killing if that means they get enough money to buy more drugs. Guess why crime skyrockets where drugs are more used?
Oh, and they take everyone's tax money (at least in countries that have public health ;))