Recent changes in the incidence in all types of drug dependence in Great Britain.

Dr T H Bewley discusses recent increases in the incidence of all types of drug dependence in Great Britain.Dr P H Connell considers the problem of amphetamine dependence historically and in different age groups and draws attention to the sociocultural patterns of behaviour which have sprung up amongst the adolescent and young adult population. Treatment is discussed.Dr R H V Ollendorff outlines a theory of drug addiction based upon seven aetiological factors, and stresses the importance of the general practitioner in treating the addict.