He could also get that way from driving a car, being thrown from a horse, or any number of activities that are a personal choice.

Maybe a bunch of people try this and end up with terrible side effects. Researchers will still be interested in the results if they know what a person did to themself. And then maybe some of them will have good results and then we'll all know. It's a mixed bag and probably a very tiny percent of the population. I say let em go for it.