Amphetamine is related to drugs such as methamphetamine and dextroamphetamine, which are a group of potent drugs that act by increasing levels of norepinephrine, serotonin and dopamine in the brain, inducing euphoria.
Hoid is King Elhokar's Wit and entertainer. He is a recurring mysterious character in the Cosmere. He has been hinted to be a rouge student of Silverlight University. He has abandoned his real name.
Who is Hoid? Hoid is a mystery which I cannot speak on other than what has been written in the text of the novels. Mostly this is for you to piece together. As I said before, this is a story I'm telling, and if I have to explain the story outside the story, then in some ways I've done something wrong. So let the story speak for itself, and you will see. I guess that's a RAFO (Read And Find Out).