Several reasons for pot being claimed as better now than ‘then’. One being the seed pushers and breeders making such claims want to sell you crossed seeds. I have had this argument for years now, that my landraces are not as good as the newer Amsterdam crosses. That argument goes back as long ago as 1978 or so with my oldest brother and his breeding partner in Pacific Valley (at the south end of Big Sur). I am of the Big Sur Holy Weed philosophy that you grow landraces as is, and they can be improved simply by growing sinsemilia, or growing indoors under lights. And more important, growing indoors or in a GH with night heat when finishing. Night heat (or warmth) has been shown to increase potency rather dramatically, and why indoor typically is more potent that out. Also as I said before, lots of people like indica and couchlock, rather than sativa and brain freeze. I have grown Durban that is like 20%, but the THCv in there competes with the THC receptors and you do not THINK that you are as high as you really are, so you smoke more… and then WHAM! The THCv lasts for only about 20 minutes and then fades. But it is a different high than indica.
THE most potent weed I have ever smoked was a sativa, a South Indian Ganja. I got a few oz’s of that stuff from my GF from Hawaii at that time that was mad at me for giving her a J of the Guerrero that I had a half pound of. She smoked the J and froze up for 2 hours and was unable to go anywhere. So she got me the ganja as ‘revenge’. But I was immune to that for some reason, and others froze up on it but I did not. That Guerrero was the second most potent weed I have ever smoked, to date. Anyway, they were both bought back in 1975. In “general” a lot of weed back then was low quality bricked, from Mexico and Colombia. But there was better to be had, mostly loose tops from Colombia/Panama and Mexico, sticky ganja, hashish, and SE Asian Cambodian Red, and the skinny Thai sticks. The Thai sticks were covered in trichomes, and they glistened. These were not the later fat sticks that were dipped in hash oil and made me pass out, but the zippy trippy Thai that made you feel really really good. It was like Durban Poison. Good Cambodian Red was also potent as all fuk. But now anything red from SE Asia is called Cambodian and a lot of it is bunk. Yeh had to shop around for the good weed in the 70s, but it was out there.