In his work on alcohol and drug use, Singer explains that all drugs are commodities and draws attention to social constructions of legitimate or legal and illegitimate or illegal drugs. In his book Drugging the Poor: Legal and Illegal Drugs and Social Inequality, Singer notes that all drugs are forms of self-medicating, and that distinctions of legal or illegal serve to reinforce social hierarchies and inequalities. Furthermore, Singer argues that drug use among the poor is a type of self-medicating in response to the pressures of being poor. Responding to ways illegal drug users are vilified, Singer argues that by using language of blame to describe drug users as responsible for deteriorating urban centers, “attention is diverted from the role of class inequality as a source of social misery.”