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It is relatively easier to spot crystal meth addicts than those who abuse other drugs. More often than not, open sores appear on the faces of crystal meth addicts. These sores eventually lead to scarring, which tends to be irreversible even when the abuser has quit the drug. Apart from this, other visible crystal meth effects include tooth loss, sunken cheeks, aged appearances and unhealthy-looking weight loss.

Source: Multnomah County Sheriff's Office