How is acid supposed to be relevant to ADHD? (I took it a few times. Sometimes it was good, sometimes it wasn't, I don't regret it any way and I don't have ADD).

Ritalin polarizes opinions more than it ought to. For some kids it may well be appropriate, at least for a while. More often it's prescribed because neither the doctor nor the parent has the guts to say NO to television, MP3 players, mobile phones and computer games. ADHD is usually just a natural response to a toxic lifestyle deranged by excessive electronics and insufficient silence.