Notes in Fallout 76 can be found scattered across Appalachia, and can contain scraps of lore, the stories of those who once lived in West Virginia, and various other information.
Transcript for Allemane's Code
Sgt. Allemane, your code phrase for the Master Terminal is "Smoker Boy." Yes, I'm telling you to kick the habit. Don't you got enough nasty going into your lungs?
Where to find Allemane's Code