: Most drugs flood the brain's reward circuit with dopamine, creating euphoria.
Addiction is defined as a characterized by compulsive seeking and use of substances despite harmful consequences. drug and alcohol abuse
Drug addiction (substance use disorder) - Symptoms and causes : Most drugs flood the brain's reward circuit
: Over time, the brain reduces its natural dopamine production, leading to tolerance —the need for higher amounts of a substance to achieve the same effect. drug and alcohol abuse