It's not 4x as potent now..when the potency was meausred, it was used with 70s brick weed stored in police lockers, versus some dank weed from today. You get the picture.

And yes, there are different strains, it's plant genetics, they can mix different strains together to produce results..you should have learned about male and female seeds in basic biology. So basically, all this could be done, if it were legalized. But that's not looking good, so don't look forward to that happening in the US. But now Canada..theyr'e close to legalizing it. So maybe something like that will happen there. All we can do now is smoke dank buds, and hope.