[pmoriarty]

"The problem with your advice is that it comes with the risk of grievous bodily harm."

I hope you don't ride in cars or cross streets, because they also come with risks of grievous bodily harm.

"Drugs have a high risk of being dangerous, hazardous, addicting, etc.-- that's why they're controlled substances."

Food and sex can be addictive, and plenty of people's health is ruined by them.

Also, plenty of dangerous, hazardous, and addictive drugs like alcohol and cigarettes are not controlled substances.

Psychedelic and cannabis use was associated with minorities, the counterculture, and antiwar protestors. They were seen as a threat to the status quo. Those and some sensationalistic media scares were the real reasons they were banned.