I think there's two categories of drugs and it's harmful to ignore the distinction. I don't know enough about the specifics of all drugs to nail down the definitions precisely but a description will suffice. One category is "psychedelic", the other is opiate. Marijuana is a federal schedule 1 drug in the US, right next to heroin. If we don't train society to differentiate between these two then unsuspecting young people who experiment with marijuana illicitly will say "all those warnings were over something harmless. I'll try heroin next." The war on drugs is perpetuating weed as a gateway to more dangerous drugs. The THC and psilocybin family has its risks in the same way that alcohol and nicotine have their risks; the opiate and methamphetamine family should not be confused or taken lightly by anybody.