These days adolescents who use drugs, including alcohol, do so because they like the feeling of what the drugs do to their brain. All drugs of abuse, from alcohol to nicotine to heroin, cause a series of temporary changes in the brain that produces the "high."

The pleasure of a kiss, a bowl of your favourite ice cream, and a compliment may all be related to a rise in dopamine levels in the normal person's brain. Drugs of abuse also boost dopamine levels. When a person takes a hit of crack cocaine -- or a drag on a cigarette -- the drugs cause a spike in dopamine levels in the brain, and a rush of euphoria, or pleasure. While it's not the only chemical involved in drug abuse, experts have come to believe that dopamine is the crucial one.

In 2001 a study was led by researcher Dr. Nora Volkow of the Brookhaven National Laboratory in Upton, NY, Dr. Volkow found a significant relationship between the intensity and duration of the rush of dopamine levels ass

The review found that, in some cases, skills-based programmes in America led to an increase in drug use.

Adolescents also take drugs because they are bitter and bored with the economic and political system in which they live.

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