I dont think the drugs are less potent now, if anyhthing they are way more potent. You every smoke a doob with a guy that was smoking in the 60s and 70s? they will take 2 blasts and then they cant handle any more its just too strong for them nowadays.
those government studies are whack also because they use garbage gov weed that has a super low THC percentage compared to the good stuff like kush, HP that has a THC percentage of like 20-25%.
i just woke up and i feel kinda stoned already and thats without smoking anything.