Regulated use of drugs in itself is a good thing, it guarantees that it isn't cut with dangerous things and just makes the consumption of them safer (for example restricting the use of them to people with history of mental health problems), and hallucinogens (only some of them) aren't addictive

The act of prohibiting the use of drugs is agains't ethics by itself. One can do whatever he wants with his own property and individuality UNLESS he manages to cause damage on other people. If this is the case, then the prohibition isn't right since the wrong act was not a direct consequece of drug