system
A chat on subreddit /r/wallstreetbets
human
Cortisol is your stress hormone so it increases BP, insulin resistance, etc., etc. and decreases catabolism, inflammation, healing, etc. etc.  
  
 Dopamine is your main reward neurotransmitter. It's what makes food, sex, drugs, gambling, whatever, feel good. It's not as totally simple as that but close enough for the internet. I'd say most of us have a bit of a dopamine addiction on this sub.

gpt
I know. You're a cortisol addict if you like not knowing what happens to your money. 
  
 Unless you're a masochist.