Methamphetamine (meth) is a highly addictive stimulant that affects the central nervous system and can have long-term negative mental and physical effects. It is an illegal drug that is often manufactured in makeshift underground labs which can lead to explosions and fires due to improper production methods. Meth use has been shown to potentially cause paranoia, aggression, memory loss, dental problems, and even death from overdose or complications from long-term use.