The costs of an addiction not only affect the sufferer but can also encompass family, friends and society as a whole. There are the costs of policing, drug addiction help lines, support groups and rehab clinics. Indirectly there is lost revenue in the form of tax and national insurance contributions each time an addict loses their job or is unable to work. This means a drop in revenue for the Treasury and an increase in welfare benefits, e.g. unemployment benefit.