Idk where you get your info from. There is sound science, not just anecdotes, about the benefits of drugs for enhancing cognitive performance. Like I said in the comment you responded to, it doesn’t cure dementia or anything.

I think it’s propaganda that tells people stimulants just make people “more jittery” or “appear anxious”. Then if people take the drugs they can rationalize it by saying, “oh if I was normal then maybe stimulants would just make me anxious, but cocaine actually helps me focus and get my work done, or calms my nerves.” Which is true for everyone the first many times they try stimulants.