Reasons why patients use substances are complex and impacted by a wide range of biopsychosocial factors that will vary from person to person. Some population groups do have a higher risk of harms associated with their substance use5. These include Aboriginal and Torres Strait Islander peoples, lesbian, gay, bisexual, transgender, intersex, queer, asexual and other sexually or gender diverse (LGBTIQA+) people, people experiencing homelessness, older people, younger people, and those from culturally and linguistically diverse backgrounds. Those with mental health conditions, who have experienced trauma, have been in contact with the criminal justice system, or inject drugs, are also at higher risk. Refer to the resource links in the AOD Resource List at the bottom of this page under Priority Populations.