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Transition from drug to drug dependence is something that does not start over night, but gradually happens. Drug use can be something that can be done on a daily basis or once or twice a week. The person might use the drug to get severely high. That person can even cause an overdose. Development entails both quantitiv and qualitative changes. Time is a critical dimensionin development. Over time the patterns of change in behavior may be defined both in terms of quantity-the level