The theme of harm reduction recognises that a valid aim of alcohol and drug interventions is to reduce the “relative risks” associated with their use. Harm reduction is a core theme for prevention as it recognises that in cases where it is not possible to entirely prevent or stop substance use, there are benefits for individuals; health and social care services; and wider society in limiting substance-related harm. 

Harm reduction is linked to person-led approaches in that it is designed to help people “define and reach their own goals” regarding alcohol or drug use, without “presupposing that they have a specific goal in mind” e.g. abstinence.