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1

Surveys find that 41 percent of high school seniors have used an illegal drug within the last year, and 30 percent report having been drunk on alcohol. The figures for the adult population are .
2

Addictions may be based; the body becomes so accustomed to functioning in the presence of a drug that it cannot function in its absence. Or they may be based, in which case people believe that they need the drug in order to respond to the stresses of daily living.
3

is among the most difficult of all behaviors to modify, even with extensive treatment.
4

The major behavioral effects of caffeine are an increase in attentiveness and a decrease in reaction time. However, regular users who suddenly stop drinking coffee may experience .
5

The depressant used most commonly is .
6

Common plants, such as , can be a source of a powerful hallucinogen, a drug that is capable of producing changes in the perceptual process.





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