What is mood though? Certain types of thoughts? Feeling? Feeling pain or pleasure? Certain morals are different in different places in the world.. so happy music can be considered sad or happy and the opposite in other places.. so people can be considered to be happy.. people like pain (Masochism), or causing pain..

Wow I'm way out there.. Idk why this happens to me.. I didn't take any sort of drug.. THC atoms did get into my brain from the people smoking weed around me but that can't possibly have an effect.. unless it's microdose theory.. Which I don't believe.

Edit: Molecules.. not atoms.. But who cares?