A commentary on the effects of methamphetamine and the status of methamphetamine abuse among youths in South Korea, Japan, and China.

Methamphetamine (MA) abuse continues in East Asia and shows an increasing trend among youths in South Korea, Japan, and China. Although the negative effects of MA abuse on youth are considered as significant problems, few studies have been conducted on the topic in these countries. This paper focuses on the effects of MA on the human body and current MA abuse among youths in South Korea, Japan, and China. To investigate the negative effects of MA on the human body, we searched the keywords "MA," "human," and "effect" for studies published from 2013 to 2017. MA activates the neurotransmitter system and the central nervous system, and when used at high dosage or for long term, MA can cause severe neurotoxicity and cardiovascular problems. Online networks contribute to MA abuse by sharing methods for preparing synthetic MA. Despite efforts to reduce MA abuse, social crimes associated with its abuse continue and numbers of illegal MA users are increasing steadily in Korea, Japan, and China. In young users, diverse factors associated with drug addiction, such as curiosity and peer effect, lead to MA abuse and its attendant personal and social problems.