Marijuana was the ONLY drug that was illegal back in the 1930s.
Cocaine, heroin and all the hard stuff was perfectly legal.
What does that tell you?
It says that you don't know shit about cannabis.
Marijuana was made illegal because an FBI man who hated Hispanic and African people (who at the time were the most prominent consumers of cannabis), so in order for him to lock them up legally, he had to go after something that they used, make it illegal, an then lock up the black and brown people for using something that was made illegal.
Incidentally, that's the reason for the really high sentences.
Anslinger (the FBI man) also enlisted the help of Hearst (who owned a publishing company and had forests), as well as the help of DuPont (who had just figured out how to make plastic from oil), to make cannabis illegal and help finance his war on marijuana.
Follow that up with a propaganda film called "Reefer Madness" (which is completely false with reference to how pot smokers act), and you've got them all falling in line.
Cannabis has been PROVEN to help with glaucoma, people with cancer undergoing radiation therapy, people with Alzheimer's, some research is promising to help with people who are autistic, as well as many other things.
The only people who think it is harmful are the lemmings such as yourself who believe bullshit without researching it. Harvard Medical and the Royal British Medical Society (both are collections of very talented doctors) would disagree with you.
And.....they have facts, you don't.