Methamphetamine is one of the most profoundly used illicit substances in the United States. In 2007, 4.5 % of tenth grade students reported using meth at least once in their life. Meth can be used through smoking, inhaled, injected and orally ingested. The effects usually last from four to eight hours or more, depending on dosage. The effects of using meth are insomnia, confusion, hallucination, anxiety, paranoia and death. Having support from family and friends through meth rehab can greatly increase the chances of recovery.