This graph shows that every time a person takes the drug they go on a high and then a low but each time they get a low they take the drug again. Taking the drug again they don't get to the fantastic high they had the first time. So a person takes the drug again and again to until the drug makes them feel normal. Without the drug they would feel cold and like the flue but 20 times worse. The person will keep taking the drug to make them feel normal.
Addiction is when a person takes a drug to feel normal.
The function of the brain is effected by drug use.
Memory
Reason
Judgement
Mechanical skills
Intellect
Concentrate
Emotions
