People are overlooking the fact that IQ does not test intelligence, but aptitude, and those with privilege get higher test results.
Plus Rand Paul is just wrong... but you know, the continual war on drugs makes his point more salient to ignorant people. If the U.S. would just reform its scheduling system based on modern scientifical and medical research, it would usher in the entire world moving into a greater period of living.
Unfortunately, the government will keep saying stupid things like pot kills brain cells or damages intelligence, over and over again, no matter how many times it is proven wrong. That's what propaganda is. It's not true, but it's persistent. They don't want people taking entheogens that will wake them up to how ridiculous our system of forced control is.