Effects and Danger

Users feel a euphoric rush from methamphetamine, particularly if it is smoked or shot up. But they can develop tolerance quickly — and will use more meth for longer periods of time, resulting in sleeplessness, paranoia, and hallucinations.
Users sometimes have intense delusions such as believing that there are insects crawling under their skin.
Prolonged use may result in violent, aggressive behavior, psychosis, and brain damage.
The chemicals used to make methamphetamine can also be dangerous to both people and the environment.