Might as well legalize it. It isn't really dangerous, and it has medicinal uses. Besides, if it is legalized, it's just another thing drug cartels will lose money on, because there will be no need to smuggle it in, decreasing illegal activity and violence. Personally, I have no interest in using it.
Just wondering, are you joking? If not, have you ever heard of a brain scan? They have been used to show that those diagnosed with autism have weaker neural activity, compared to someone who is "normal". There has also been research on connections between autism and immune system weakness. I've known some people with extremely heavy autism. Heck, even have a family member who is autistic. He's been in a mental health clinic his whole life. He hasn't said a word to anyone since he was 8, and now he's over 30, if I recall. There's more to it than just a "fake mental problem".
Edit: Sources:
Autism Research with Brain Activity
Autism in Immune-systems 1
Autism in Immune-systems 2