I sold a little pot around D.C. in the late 60"s . . . 120$ lb / 15 a lid (oz) and have grown my stash since the mid-70's. There were some 'special" strains back then . . . Santa Marta Gold comes to mind, Oxacan, others I can't spell, like Mish-me-a-con . . . there's no doubt in my mind that today's strains are much stronger. I mean, it don't get much better than one hit citrus, IMO.
Dad never smoked pot, RIP, but once we had just fluffed some "blond Lebanese" I think, and he came home from work early, so we dumped it in his pipe tobacco humidor type thingy.
I'll never forget the old bigot, kicked back in his red recliner, listening to Neil Young thru headphones that day. He never knew.
Footnote: I moved away right after hi-school and didn't see any of my family much after that. The sad thing is that Dad basically killed himself w/alcohol.
Maybe if I'd stayed around, he (and my 3 bros) would have seen pots not such a bad thing after all.