Meth addiction, like addiction to other substances, typically starts with initial experimentation or recreational use. Over time, repeated use of meth can lead to tolerance, dependence, and addiction. Meth is a highly addictive stimulant drug that increases the release of dopamine in the brain, leading to intense feelings of pleasure and reward. With continued use, the brain becomes dependent on the drug to release dopamine, which can lead to physical and psychological dependence. Other factors that can contribute to the development of meth addiction include genetics, environmental factors, and mental health issues.