Methamphetamine can be swallowed, snorted, smoked and injected by users.
Americans who use methamphetamine on a monthly basis has hovered in the range of 0.2 percent to 0.3 percent since 1999.
The effects usually last from four to eight hours or more, depending on dosage.
Only 512,000 people use meth within the last 30 days.
Methamphetamine has been widely marketed to women for weight loss and to treat depression.
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