Methamphetamine is a powerful, highly addictive stimulant that affects the central nervous system. Also known as meth, chalk, ice, and crystal, among many other terms, it takes the form of a white, odorless, bitter-tasting crystalline powder that easily dissolves in water or alcohol.
According to the 2012 National Survey on Drug Use and Health (NSDUH), approximately 1.2 million people (0.4 percent of the population) reported using methamphetamine in the past year. In 2012, there were 133,000 new users of methamphetamine age 12 or older—the same as the previous year. The average age of new methamphetamine users in 2012 was 19.7 years old.