Final answer:
A person addicted to methamphetamine, or "crystal meth," is using a highly addictive psychostimulant that causes intense euphoria and severe health issues. Drug addiction is the compulsive use of such substances despite harmful consequences, and treatment often involves psychotherapy and support groups.
Step-by-step explanation:
A person addicted to crystal meth is using a highly addictive substance known as methamphetamine. This psychostimulant not only causes intense euphoria but also severe long-term health issues like dental problems, skin abrasions, memory loss, sleep problems, violent behavior, paranoia, and hallucinations. Methamphetamine's addictive quality is due to the intense craving it produces, making it a challenging addiction to treat. Drug addiction refers to the compulsive use of substances like psychoactive drugs despite the negative consequences that arise from their use.
Aside from methamphetamine, there are other stimulant drugs like MDMA which produce a euphoric high and alter perceptions. However, the use of these substances can result in adverse effects such as nausea, increased blood pressure, increased heart rate, anxiety, and paranoia.
In a clinical context, drug abuse is the use of a drug without medical professional advice and for purposes not originally intended. It's critical to note that rehabilitation from addiction often involves psychotherapy and may be supported by mutual aid fellowships such as Alcoholics Anonymous and Narcotics Anonymous. In some cases, medications such as methadone are used to treat addiction to other substances like heroin.