Psychical addiction and psychological addiction appear in similar manners, but are caused by different functions of the body. Physical addiction is a psychical dependency on a drug or substance whereas psychological addiction is a mental dependency on a drug or substance. Despite these differences, the symptoms of addiction appear in similar manners.

Signs of addiction include, but are not limited to: aggression, depression, shakiness, insomnia, cravings, mood swings, feelings of hotness, clamminess, nausea, fatigue, lethargy, loss of appetite, headaches, and anxiety.

Psychical addiction involves a physical dependency on a drug or substance. This addiction occurs when a drug or substance begins to be necessary for the body to function normally; as a tolerance is built up against the drug, the body becomes accustomed to having the drug and therefore withdrawals when the drug is suddenly stopped, therefore causing the physical addiction. Some things that can become physically addicting are painkillers, alcohol, and certain drugs.

Psychological addiction involves a psychological dependency on a drug or substance. This addiction occurs when a drug or substance is ingested or injected and alters the chemistry of the brain. As the brain gains a tolerance to the drug by adding more hormones or depleting hormones, the drug begins to lose its effectiveness, thus taking more to reach a high. Once the drug is stopped, withdrawal occurs.

Marijuana is a psychologically addictive drug, meaning that, instead of altering the physical body, it alters the chemistry of the brain. However, a person withdrawing from the use of marijuana will experience the physical symptoms of withdrawal, just as a person with a physical addiction would experience the psychological effects of withdrawal.
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