hemp was grown in the south, but what is sold in the US as marijuana is much stronger than was sold in the 1960’s...
it’s like the difference between 2 percent beer (a mild calming effect) and whiskey. Think Hashish...
Sounds like you have first hand experience today from what was sold in the 60’s. I agree that pot sold today is much stronger than was sold then. I would not call it hashish as I have not seen any since about 1975.