Methamphetamines can harm the user physically and mentally, even resulting in death. Dealers sometimes stretch their drug supplies further by mixing powdered crystal meth with other substances. This can make it even more dangerous.
Depending on what is available, the dealers may use anything from chloroform (a chemical that makes people unconscious) to gasoline additives. The user of methamphetamines will become physically addicted and psychologically dependent. With continued use, more and more of the drug is needed to achieve the same effects.
Methamphetamines are illegal drugs. To support his or her habit, the user might steal, which could lead to arrests, fines and jail time.