You always will be singing a song or humming a line or a melody.
Drugs have played no significant factor in my life.
Well, until this very day, I'm still learning.
Certain rhythms just have certain moods.
Every day you learn something new.
But when you have to deal with notes, and to be able to make a full definition of what a sound is - if you are not around that environment, then you'll find you lose that feel, that momentum, you lose all that.