Today’s marijuana is far more potent than what was available in the ‘60s.
You can still buy crappy Mexican weed if that’s your choice.
They say that because of THC content.
My opinion - THC - when smoked - has a medically ignored saturation issue.
Once THC reaches a certain level in your blood stream, you do not get higher.
However, I have read that you can OD if you eat marijuana, which seems logical.
I grew up in south Florida in the 1960s and had access to the best weed in the world.
We had one hit weed in the 1960s - just like they have one hit weed in 2024.
My opinion - if marijuana is outlawed, alcohol should be outlawed, too.
Full Disclosure - I never enjoyed alcohol, drank only because my friends drank, quit in 1985.
If all the alcohol in the world disappeared tomorrow, I would not notice unless someone told me.