In the 1970's everything I had access to was Mexican, Colombian and once Hawaiian I got direct from the island. Those were all considered Sativa. Except for the Hawaiian, all the weed I smoked in those days had seeds.
Now, every thing I have smoked or grown is seedless so far as I either used feminized seeds or destroyed the male plants when using regular seeds. Everything I have grown has been advertised as hybrids or indicas.
For the most part I get high by smoking very little. The plants I grow give me nice yields and frosty buds and sugar leaves and is some of the best looking and smelling weed I have ever had.
But....it never gives me the same high when smoked that I always experienced back in the 1970's and 1980's when I use to get the seedy Mexican and Colombian weed common in those days. The weed of those days was more psychoactive in its effects on me. I actually had hallucinations, paranoia, couch lock where you couldn't move at all, time lapses.
I don't experience any of that with medical dispensary weed I have been given or anything I have grown. Even when letting a plant grow longer than usual.
I have been able to get that effect when I have made edibles though. But since the marijuana has to be metabolized first when ingested as an edible, it takes 30 minutes to two hours before it hits me versus seconds or minutes by smoking where it goes directly into the bloodstream to the brain.
In my opinion, that gives me the feeling that the post above holds more than a grain of truth. Any weed I consume in edibles gives me the same effects that 1970's Sativas did. All those different types of weeds I smoked and liked in the 1970's and 1980's were grown under natural sunlight in Southern latitudes, warmer climates and even when full of seeds seemed more psychoactive than today's high THC strains.