on the Salts bottle it says 'stay awake!' and soda and coffee add to your Salts... so at first i thought Vigors were powered by caffeine... but cigarettes also give Salts and i don't think there is caffeine in cigarettes so... what ingredient does soda, coffee and cigarettes share?
haha That was pretty funny. Do you think you could do one with the vigors? I found interesting how booker has do injest them. Imagine what it must feel like to have one of those vigors pass through the digestive system.