1. Drug abuse can cause disease of the brain. Continuous usage brings changes in the brain chemistry that results in a change of behavior. It alters the area of the brain responsible for self control, judgment, motivation, memory and learning. Thus, a person when high in drugs, is usually out of control. Emotions are like a roller coaster ride that can have an effect of extreme behavioral moods. Take a marijuana user for example. When he is “high”, it can cause extremes of either crying or laughter.
2. One major reason for a person to go into drug usage is to “escape reality”. Realities in life in the form of physical or emotional discomfort brought about by problems or series of negative crises in life can cause a person to go into depression.
For more information on causes of drug abuse click here