Wake-up in the bloodstream. It fills the need for rest by stimulating the brain, and increases focus, allowing faster work. It also increases the psyfocus gains from meditation.
A chemical addiction to wake-up. Long-term presence of wake-up has caused neurological adaptations at the cellular level, so the brain can no longer function properly without the drug.
Without regular doses of wake-up, withdrawal symptoms will begin. However, extended abstinence will force the brain to adapt back to its normal state, resolving the addiction.