Very severely. Everytime I walk out my front door, I see examples of poisoned, dumbed down cattle walking straight into the bolt pistol.
It happens quickly and insidiously sometimes. When I was younger, I felt like I could "think to infinity", almost like when you feel like you can inhale indefinitely. It feels good. But now, my mental process is quite lacking in comparison. It's hard to think, to focus, to concentrate, and conceive. I believe there is hope though, as I've made some progress. Two years ago I was hallucinating, having delusions, brain fog, etc. I was out of my mind. With the little I've done to heal myself, I haven't had strong delusions or hallucinations in months.
I think a lot of it is survival of the fittest though. When people kill themselves with drugs, acts of stupidity, etc., it really is darwinism at work. Some people have inquiring minds and some people don't. Some people can improve and change, and some people can't. Some people are seeking and some people are complacent. Survival of the fittest. Sad to say, but the people who die because of inability to change are really weeding themselves out. I'd like to believe that everyone has the same unlimited potential, but that belief is proven wrong every day.
Of course, with all the disinformation, poison, etc., that the rulers of this world throw at us, it isn't easy to discern the truth, but I believe the truth is there for those who diligently seek it.
"He who has ears to hear, let him hear." Not everyone has ears to hear.