Drug addiction is a social evil. It has been prevalent in society from time immemorial. There are a variety of drugs which are used in various forms. A drug addict becomes a drug dependent. He cannot live without drugs. It is a form of psychological conditioning that implies a set of mental and behavioural responses to drugs and related stimuli that result from repeated reinforcement produced by the use of drugs.
It implies physical, psychological and psychic dependence on the tolerance of a drug with a tendency to take more and more drugs. The World Health Organisation has defined drug abuse as a state of periodic, chronic intoxication, detrimental to the individual and to the society, produced by repeated consumption of drugs either natural or synthetic. In other words, the growing urge results in increase of doses.