People who relapse on drugs after a period of being clean often return and dangerously overdose due to their pre-existing tolerance. Similarly, a person's desire to return to a favourite food spot is attributed to narcissism and the need to feed oneself to stay alive.
Narcissism is not just a negative personality trait, but a necessary one for survival as it drives our behavior to seek out what we need and desire. Even something as simple as having food cravings and returning to the same spot for food is an expression of narcissism.
The addiction tolerance can lead people who are addicted to overdose when they start taking the same amount they were taking before getting clean. Hyperstimulating triggers cause unnaturally high levels of dopamine and serotonin, making people crave more stimulation.